Lightmass crashed UE4.18

Development Rendering
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1

So when i was trying to build lighting in my level for some reason it gave me following errors:-

  • === Lightmass crashed: ===
    Assertion failed: Importer.ImportData((FBaseMaterialData*)this) [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Programs\UnrealLightmass\Private\ImportExport\Material.cpp] [Line: 13]

0x000000002CC01F28 KERNELBASE.dll!UnknownFunction []
0x00000000DF8C5E54 UnrealLightmass-ApplicationCore.dll!UnknownFunction []
0x00000000DE6B1A8B UnrealLightmass-Core.dll!UnknownFunction []
0x00000000DE642E98 UnrealLightmass-Core.dll!UnknownFunction []
0x000000006F122860 UnrealLightmass.exe!UnknownFunction []
0x000000006F0D593A UnrealLightmass.exe!UnknownFunction []
0x000000006F126587 UnrealLightmass.exe!UnknownFunction []
0x000000006F18977A UnrealLightmass.exe!UnknownFunction []
0x000000006F0D8CFA UnrealLightmass.exe!UnknownFunction []
0x000000006F12413B UnrealLightmass.exe!UnknownFunction []
0x000000006F126BAD UnrealLightmass.exe!UnknownFunction []
0x000000006F0F5771 UnrealLightmass.exe!UnknownFunction []
0x000000006F12D863 UnrealLightmass.exe!UnknownFunction []
0x000000006F1504DA UnrealLightmass.exe!UnknownFunction []
0x000000006F1AEC25 UnrealLightmass.exe!UnknownFunction []
0x00000000300B8102 KERNEL32.DLL!UnknownFunction []
0x000000003045C5B4 ntdll.dll!UnknownFunction []
0x000000003045C5B4 ntdll.dll!UnknownFunction []

I Searched online but i couldn’t find an fix. So please help me.

2

Try to check the warnings while build light. Maybe some of your actor has lightmap issues. Try to remove this actors and build again to check if it fails.

1 Like
3

clear swarm cache as well.

1 Like
4

MAN, you just saved my time! Many greetings from here!

5

Thank you!!)