Lightmass crashed - Assertion failed

Development Platform & Builds
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1

Hello everyone,
I am new to Unreal Platform. When I build light only, it cashed and showed out this error :frowning: . I have not found solution for this for a week. Hope someone helps me with this. Thanks
=== Lightmass crashed: ===
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 691]
Array index out of bounds: 513 from an array of size 513

0x00007ff7634a2dac UnrealLightmass.exe!Lightmass::FStaticMeshStaticLightingMesh::GetTriangleIndices() []
0x00007ff76341b05a UnrealLightmass.exe!Lightmass::FEmbreeGeometry::FEmbreeGeometry() []
0x00007ff763424f55 UnrealLightmass.exe!Lightmass::FEmbreeAggregateMesh::AddMesh() []
0x00007ff76347421e UnrealLightmass.exe!Lightmass::FStaticLightingSystem::FStaticLightingSystem() []
0x00007ff7634298b1 UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff76344cda1 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff76346cf97 UnrealLightmass.exe!main() []
0x00007ff7634d5ebc UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ffb82dc26ad KERNEL32.DLL!UnknownFunction []
0x00007ffb8420aa68 ntdll.dll!UnknownFunction []

2

Greetings @LHKaay

It looks like an issue with trying to access an element that is outside the size of the array. Take a look at this post for an example of another user running into this same issue.