GPU Lightmass Error: Array index out of bounds

Development Rendering
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1

I’m getting the following error. I have tried clearing and validating the swarm cache I have tried enabling and disabling bForceNoPrecomuputedLighting and I have checked to make sure my ram isn’t getting maxed out. What is causing this?

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Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 1095]
Array index out of bounds: 2 into an array of size 2

UnrealEditor_Core
UnrealEditor_GPULightmass
UnrealEditor_GPULightmass
UnrealEditor_GPULightmass
UnrealEditor_GPULightmass
UnrealEditor_RenderCore
UnrealEditor_RenderCore
UnrealEditor_RenderCore
UnrealEditor_RenderCore
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_RenderCore
UnrealEditor_RenderCore
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll

2

It was because I didn’t have ‘Path Tracing’ enabled in the project settings.

3

This has started happening again same error this time it’s only on one level though despite all my lightmass settings in the world settings being at default.