Suddenly quit during using UE5 project

Development Getting Started & Setup
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Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectHash.cpp] [Line: 890] Internal Error: RemoveFromClassMap NumRemoved = 0 for MaterialInstanceDynamic /Engine/Transient.MaterialInstanceDynamic_307

UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_UnrealEd
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
InkObj

I’ve tried reinstalling UE5 and the window system, but it doesn’t work.

Does anyone have an idea as to how this can be fixed?

2

Hi Sookie, Welcome to the Forums.

Generally you should never have to re-install windows to fix a UE crash!

Do you also crash with a newly created project?

“MaterialInstanceDynamic” is standing out to me, do you know if any of your Blueprints are using Dynamic Material Instances? (Usually would take the form of a ‘Create Dynamic Material Instance’ node or a “Material Instance Dynamic Object Reference” variable somewhere.

Also, try disabling Edit → Project Settings → ‘Create Garbage Collector UObject Clusters’