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Steps to reproduce:
1. Create new Unity project using AR Mobile Template
2. Once project is created, observe the Console window
Actual results: “NullReferenceException: Object reference not set to an instance of an object” error is thrown in the Console window
Expected results: No errors are thrown in the Console window
Reproducible with versions: 6000.7.0a3
Not reproducible with versions: 6000.7.0a1, 6000.7.0a2
Tested on (OS): Ubuntu 24.06, macOS Tahoe 26.5.2 (M1)
Notes:
NullReferenceException: Object reference not set to an instance of an object Unity.UIToolkit.Editor.UIViewportWindow.ReleaseStage (UnityEngine.EntityId stageId) (at /Users/bokken/build/output/unity/unity/Modules/UIToolkitAuthoringEditor/Managed/Scene/UIViewportWindow.cs:280) Unity.UIToolkit.Editor.UIViewportWindow.OnDestroy () (at /Users/bokken/build/output/unity/unity/Modules/UIToolkitAuthoringEditor/Managed/Scene/UIViewportWindow.cs:155) UnityEditor.EditorUtility:LoadWindowLayout(String) Unity.Tutorials.Editor.TutorialModel:LoadWindowLayout(String) (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Models/TutorialModel.cs:187) Unity.Tutorials.Editor.TutorialModel:LoadWindowLayoutWorkingCopy(String) (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Models/TutorialModel.cs:302) Unity.Tutorials.Editor.TutorialContainer:LoadTutorialProjectLayout() (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Core/Data/TutorialContainer.cs:243) Unity.Tutorials.Editor.TutorialWindow:GetOrCreateWindowAndLoadLayout(TutorialContainer, Boolean) (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Core/TutorialWindow.cs:292) Unity.Tutorials.Editor.TutorialWindow:ShowWindow(Boolean) (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Core/TutorialWindow.cs:200) Unity.Tutorials.Editor.UserStartupCode:RunStartupCode(TutorialProjectSettings) (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Core/UserStartupCode.cs:83) Unity.Tutorials.Editor.UserStartupCode:InitRunStartupCode() (at ./Library/PackageCache/com.unity.learn.iet-framework@20adddfea631/Editor/Core/UserStartupCode.cs:126) UnityEditor.EditorApplication:Internal_CallUpdateFunctions() (at /Users/bokken/build/output/unity/unity/Editor/Mono/EditorApplication.cs:413)
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