Updated package manager spews errors everywhere.

Importing an asset told me that it needed an updated package manager so I did it and now I’ve got hundreds of errors, It started with: Script updater for Library\Bee\artifacts\1900b0aE.dag\Unity.PackageManagerUI.Editor.dll failed to produce updates.txt file

then followed by a few hundred other errors. I’ve deleted the Library folder, I’ve made sure there are no spaces in my project path and I’ve also turned the Bee folder off of Read-Only even though it reverts after each launch.

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\AssemblyInfo.cs(7,12): error CS0246: The type or namespace name 'UxmlNamespacePrefixAttribute' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\AssemblyInfo.cs(7,12): error CS0246: The type or namespace name 'UxmlNamespacePrefix' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\Services\Common\Resources.cs(1,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\Alert.cs(2,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(2,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\PopupField.cs(4,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\UIUtils.cs(1,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Interfaces\IPackageManagerExtension.cs(1,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(2,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(7,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageFiltering.cs(3,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageGroup.cs(2,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(1,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(1,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(3,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerWindow.cs(3,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(3,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(4,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Interfaces\IPackageManagerExtension.cs(14,9): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(16,45): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(39,43): error CS0246: The type or namespace name 'ChangeEvent<>' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(45,42): error CS0246: The type or namespace name 'FocusEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(50,45): error CS0246: The type or namespace name 'FocusOutEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(19,34): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(55,39): error CS0246: The type or namespace name 'FocusEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(60,42): error CS0246: The type or namespace name 'FocusOutEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(65,35): error CS0246: The type or namespace name 'AttachToPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\Services\Common\Resources.cs(14,23): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(76,35): error CS0246: The type or namespace name 'DetachFromPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(114,35): error CS0246: The type or namespace name 'AttachToPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(86,40): error CS0246: The type or namespace name 'KeyDownEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(119,35): error CS0246: The type or namespace name 'DetachFromPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(130,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(131,17): error CS0246: The type or namespace name 'TextField' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(151,40): error CS0246: The type or namespace name 'KeyDownEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(132,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\Alert.cs(16,28): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(23,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageAddFromUrlField.cs(19,42): error CS0308: The non-generic type 'PackageAddFromUrlField.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(403,17): error CS0246: The type or namespace name 'ScrollView' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\Alert.cs(71,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(404,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\Alert.cs(72,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\Alert.cs(23,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(405,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(21,37): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\Alert.cs(19,42): error CS0308: The non-generic type 'Alert.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(406,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(29,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageList.cs(22,42): error CS0308: The non-generic type 'PackageList.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(107,46): error CS0246: The type or namespace name 'ChangeEvent<>' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(16,37): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(19,42): error CS0308: The non-generic type 'LoadingSpinner.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(25,41): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(17,44): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\PopupField.cs(9,60): error CS0234: The type or namespace name 'PopupField<>' does not exist in the namespace 'UnityEditor.Experimental.UIElements' (are you missing an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(640,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(27,39): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(27,57): error CS0246: The type or namespace name 'IUxmlAttributes' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\LoadingSpinner.cs(27,78): error CS0246: The type or namespace name 'CreationContext' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\PopupField.cs(13,27): error CS0115: 'PopupField<T>.value': no suitable method found to override

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(641,18): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(79,46): error CS0246: The type or namespace name 'MouseDownEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(101,48): error CS0246: The type or namespace name 'MouseDownEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageGroup.cs(16,35): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\UIUtils.cs(9,46): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(642,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(148,35): error CS0246: The type or namespace name 'AttachToPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\UIUtils.cs(22,54): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\UIUtils.cs(36,54): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageGroup.cs(72,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\Common\UIUtils.cs(50,45): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(154,35): error CS0246: The type or namespace name 'DetachFromPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageGroup.cs(73,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(643,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(160,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageGroup.cs(22,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(161,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageGroup.cs(19,42): error CS0308: The non-generic type 'PackageGroup.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(644,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(22,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(16,34): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(18,39): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(645,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageManagerToolbar.cs(20,42): error CS0308: The non-generic type 'PackageManagerToolbar.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(646,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(131,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(144,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(132,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(647,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(133,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(146,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(134,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(147,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(648,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(26,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(148,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageItem.cs(19,42): error CS0308: The non-generic type 'PackageItem.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(649,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(24,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageStatusBar.cs(21,42): error CS0308: The non-generic type 'PackageStatusBar.UxmlFactory' cannot be used with type arguments

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(651,17): error CS0246: The type or namespace name 'ScrollView' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(652,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(653,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(654,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(655,17): error CS0246: The type or namespace name 'Label' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(17,43): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(656,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(73,46): error CS0246: The type or namespace name 'ChangeEvent<>' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(657,18): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(86,45): error CS0246: The type or namespace name 'FocusEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(96,48): error CS0246: The type or namespace name 'FocusOutEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(658,17): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(118,35): error CS0246: The type or namespace name 'AttachToPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(126,35): error CS0246: The type or namespace name 'DetachFromPanelEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(659,18): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(134,40): error CS0246: The type or namespace name 'KeyDownEvent' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(150,17): error CS0246: The type or namespace name 'TextField' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(660,18): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(151,17): error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(30,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageDetails.cs(27,26): error CS0246: The type or namespace name 'VisualElement' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.package-manager-ui@2.0.8\Editor\Sources\UI\PackageSearchToolbar.cs(20,42): error CS0308: The non-generic type 'PackageSearchToolbar.UxmlFactory' cannot be used with type arguments

Are there any fixes for this? My backed-up project version is quite behind compared to this version.

Thanks.

Updated unity and it works, Solved.

still i have problem
Assets\FishNet\Upgrading\UpgradeFromMirrorMenu.cs(2,15): error CS0234: The type or namespace name ‘Documenting’ does not exist in the namespace ‘FishNet’ (are you missing an assembly reference?)