Terrain Tool.Unity-Editor error

Hi i am verry helpless right now, because no Terrain Tool is working.
I already looked for the error but no forum or helpfull action coud help.
I am using Unity version: 2022.3.27f1 and this is my newest problem:

UnityEditor.TerrainTools.BrushSizeVariator.OnEnterToolMode (UnityEditor.TerrainTools.BrushShortcutHandler1[TKey] shortcutHandler) (at ./Library/PackageCache/com.unity.terrain-tools@5.0.4/Editor/TerrainTools/BrushControllers/BrushSizeVariator.cs:70) UnityEditor.TerrainTools.BaseBrushUIGroup+<>c.<OnEnterToolMode>b__76_0 (UnityEditor.TerrainTools.IBrushController controller) (at ./Library/PackageCache/com.unity.terrain-tools@5.0.4/Editor/TerrainTools/BrushControllers/BaseBrushUIGroup.cs:634) System.Collections.Generic.List1[T].ForEach (System.Action`1[T] action) (at :0)
UnityEditor.TerrainTools.BaseBrushUIGroup.OnEnterToolMode () (at ./Library/PackageCache/com.unity.terrain-tools@5.0.4/Editor/TerrainTools/BrushControllers/BaseBrushUIGroup.cs:634)
UnityEditor.TerrainTools.SmoothHeightTool.get_commonUI () (at ./Library/PackageCache/com.unity.terrain-tools@5.0.4/Editor/TerrainTools/SmoothHeightTool.cs:33)
UnityEditor.TerrainTools.SmoothHeightTool.OnEnterToolMode () (at ./Library/PackageCache/com.unity.terrain-tools@5.0.4/Editor/TerrainTools/SmoothHeightTool.cs:78)
UnityEditor.TerrainInspector.SetCurrentPaintToolActive () (at :0)
UnityEditor.TerrainInspector.CheckToolActivation () (at :0)
UnityEditor.TerrainInspector.set_selectedTool (UnityEditor.TerrainTool value) (at :0)
UnityEditor.TerrainInspector.OnInspectorGUI () (at :0)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass72_0.b__0 () (at :0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)


( 3 times the same error )

So basicly i need a working solution here.