UI Builder exception when selecting controls - MissingMethodException

Unity Engine
,
1

I keep running into a problem with the latest version of UI builder preview 12 -
Every time I use the UI builder to edit UXML documents, my console gets filled with the same error.
I am just using standard controls. The exception is a MissingMethodException that is thrown somewhere during the Unity.UI.Builder.BuilderAnchorer.SetStylesFromTargetStyles().

I am total unfamiliar with this class, so I have included the full stack trace below.
The exception is thrown even on a newly created UXML file, and with a blank scene loaded.
I am also having a problem where the UI builder inspector doesn’t draw (shows blank) which is probably a symptom of this same issue. Occasionally switching from the themes will update the inspector and it will start drawing, but it’s a total buggy mess, editing values in the inspector doesn’t get saved, nor does adding or reordering elements.

Unity Version: 2020.2.6f1
UI Toolkit: 1.0.0-preview.14
UI Builder 1.0.0-preview.12

Stack Trace
MissingMethodException: UnityEngine.UIElements.StyleLength UnityEngine.UIElements.ComputedStyle.get_width()

Unity.UI.Builder.BuilderAnchorer.SetStylesFromTargetStyles () (at Library/PackageCache/com.unity.ui.builder@1.0.0-preview.12/Editor/Builder/Manipulators/BuilderAnchorer.cs:54)

Unity.UI.Builder.BuilderTracker.Activate (UnityEngine.UIElements.VisualElement target) (at Library/PackageCache/com.unity.ui.builder@1.0.0-preview.12/Editor/Builder/Manipulators/BuilderTracker.cs:51)

Unity.UI.Builder.BuilderManipulator.Activate (Unity.UI.Builder.BuilderPaneWindow paneWindow, Unity.UI.Builder.BuilderSelection selection, UnityEngine.UIElements.VisualTreeAsset visualTreeAsset, UnityEngine.UIElements.VisualElement target) (at Library/PackageCache/com.unity.ui.builder@1.0.0-preview.12/Editor/Builder/Manipulators/BuilderManipulator.cs:40)

Unity.UI.Builder.BuilderViewport.SetInnerSelection (UnityEngine.UIElements.VisualElement selectedElement) (at Library/PackageCache/com.unity.ui.builder@1.0.0-preview.12/Editor/Builder/Viewport/BuilderViewport.cs:489)

Unity.UI.Builder.BuilderViewport.OnPick (UnityEngine.UIElements.MouseDownEvent evt) (at Library/PackageCache/com.unity.ui.builder@1.0.0-preview.12/Editor/Builder/Viewport/BuilderViewport.cs:353)

UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/EventCallback.cs:64)

UnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/EventCallbackRegistry.cs:341)

UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/EventHandler.cs:147)

UnityEngine.UIElements.EventDispatchUtilities.PropagateEvent (UnityEngine.UIElements.EventBase evt) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/IEventDispatchingStrategy.cs:147)

UnityEngine.UIElements.MouseEventDispatchingStrategy.SendEventToRegularTarget (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.BaseVisualElementPanel panel) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/MouseEventDispatchingStrategy.cs:35)

UnityEngine.UIElements.MouseEventDispatchingStrategy.SendEventToTarget (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.BaseVisualElementPanel panel) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/MouseEventDispatchingStrategy.cs:26)

UnityEngine.UIElements.MouseEventDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel iPanel) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Events/MouseEventDispatchingStrategy.cs:19)

UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:377)

UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:340)

UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:302)

UnityEngine.UIElements.EventDispatcher.OpenGate () (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:266)

UnityEngine.UIElements.EventDispatcherGate.Dispose () (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:75)

UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:368)

UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/EventDispatcher.cs:218)

UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/Panel.cs:398)

UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/UIElementsUtility.cs:466)

UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/UIElementsUtility.cs:209)

UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/UIElementsUtility.cs:74)

UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/Core/UIElementsUtility.cs:28)

UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at :0)

2

It is worth noting that UI Builder 1.0.0-preview.11 does not throw an exception.

3

That seems to be the same issue as described here (more or less): When updateing to Unity 2020.2.3f1 UIToolkit throws compile errors

You could try to delete the UI Builder package and reimport it. That seems to fix the issue temporarily…

4

I haven’t looked too far into that problem, but from just a surface glance that looks like it unrelated to UI Builder which is where my problem appears. Perhaps I’m wrong, but I’m not certain they are related problems.

5

Same issue here

6

The error does look similar to the thread mentioned above (MissingMethodException). The issue tracker for this bug gives a workaround in the description:
Rolling back UI Builder to 1.0.0-preview.11 and then back to 1.0.0-preview.12 fixes the issue

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7

This work around is not a permanent fix for me. The problem still crops up. I’m just going to use preview 11 until it is fixed

8

Yup, using Preview 11 is much more stable for me as well in Unity 2020.2.4f1, I’ll be sticking to this package version for a little while too!

9

Hello! A new version of the UI Builder is out and should fix these issues reported here.

1 Like