Metahuman Face constant Crash

Development Character & Animation
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1

Hi everyone,

I’m encountering a persistent crash in Unreal Engine versions 5.5, 5.4, and 5.3. Every time I import a MetaHuman and try to open either the Blueprint or the Skeletal Mesh of the head, the editor crashes immediately.

I’ve already done a full system reset and reinstalled everything from scratch. I also deleted all MetaHumans from the Megascans Library and cleared the derived data cache at this path:

C:\Users<MyUser>\AppData\Local\UnrealEngine\Common\DerivedDataCache

All the drivers are freshly reinstalled, and all assets have been downloaded again from the start. My hardware is more than capable of handling Unreal Engine and MetaHuman content.

Despite all of this, the crash still happens consistently — but only on this particular machine. On another computer, everything works perfectly using the exact same MetaHuman assets.

I even tried importing the working MetaHuman library from the other system, but the issue persists. It seems like something on this specific setup is breaking the face asset.

This is what the Crash Reporter shows:

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: -303565383 into an array of size 192282

UnrealEditor_MeshUtilitiesCommon
UnrealEditor_MeshUtilitiesCommon
UnrealEditor_MeshUtilitiesCommon
UnrealEditor_MeshUtilities
UnrealEditor_MeshUtilities
UnrealEditor_SkeletalMeshUtilitiesCommon
UnrealEditor_SkeletalMeshUtilitiesCommon
UnrealEditor_SkeletalMeshUtilitiesCommon
UnrealEditor
UnrealEditor
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll

Has anyone experienced anything similar or found a solution? I’m completely stuck and would really appreciate any help.

Thanks in advance!

2

Hello there @Enrikset!

Considering the provided error log, and the fact that the issue only takes place un a particular system, the problem must be tied to the local setup.

Since you already cleared DDC, please make sure you also clear the following contents from AppData:

… Local\UnrealEngine\5.x\Saved\Cooked
… Local\UnrealEngine\Common\Intermediate

As well as clearing both Saved and Intermediate from inside your project.

After that, refresh your nVIDIA drivers. Pick the “Clean Installation” option, as well as going for the “Developer” drivers. After that, rebuild your shaders by deleting DCC again.

Finally, test disabling Nanite, virtual shadows, and ray tracing, then import your MetaHuman once more.