Engine Crashes when loading Project

Development Platform & Builds
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1

Hello, Since weeks I am not able to load my project anymore.
In startup I get this message and I have no idea what to do:

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 783]
Array index out of bounds: 1985 into an array of size 1955

UnrealEditor_MeshDescription
UnrealEditor_MeshDescription
UnrealEditor_MeshDescription
UnrealEditor_MeshDescription
UnrealEditor_MeshDescription
UnrealEditor_MeshDescription
UnrealEditor_MeshDescription
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_MeshBuilder
UnrealEditor_MeshBuilder
UnrealEditor_MeshBuilder
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Core
UnrealEditor_Engine
UnrealEditor
UnrealEditor
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll

Am I dumb or what is the issue here?
Same in 5.3, 5.4 AND 5.5

2

Addition:

The error occured suddently…
Nothing was changed to the state the project was working.
The only thing changed in that time is the switch from quixel to fab
But could this be a cause?

3

Hey there @Dr_Brinkmann! Does this apply to all projects? I noticed you mentioned it occurs in multiple versions. It’s basically reporting that the array (likely inside the mesh description of a mesh object) isn’t the size it was expected and something tried to access outside of it’s actual range. A few times running across similar errors, there’s been one mesh that was corrupted in one way or another. Do you have any form of source control? Does this still occur on previous project versions?