Im new to UE4 I been going thru a tutorial now I create a scene and have 2 light on the scene when I run build light the Lightmass crashed Message Log see below. What can be wrong here???
Thank you all
Error <None> === Lightmass crashed: ===
Assertion failed: Importer.ImportData((FBaseMaterialData*)this) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealLightmass\Private\ImportExport\Material.cpp] [Line: 14]
KERNELBASE.dll {0x00007ffa63e68b9c} + 0 bytes
UnrealLightmass-Core.dll {0x00007ffa1b5be6bf} + 0 bytes
UnrealLightmass-Core.dll {0x00007ffa1b4a1058} + 0 bytes
UnrealLightmass-Core.dll {0x00007ffa1b482098} + 0 bytes
UnrealLightmass.exe!Lightmass::FMaterial::Import() {0x00007ff6ca29503a} + 0 bytes
UnrealLightmass.exe!Lightmass::FLightmassImporter::ConditionalImportObject<Lightmass::FMaterial,TMap<FGuid,Lightmass::FMaterial * __ptr64,FDefaultSetAllocator,TDefaultMapKeyFuncs<FGuid,Lightmass::FMaterial * __ptr64,0> > >() {0x00007ff6ca229dbc} + 0 bytes
UnrealLightmass.exe!Lightmass::FStaticLightingMesh::Import() {0x00007ff6ca297c76} + 0 bytes
UnrealLightmass.exe!Lightmass::FStaticMeshStaticLightingMesh::Import() {0x00007ff6ca3025da} + 0 bytes
UnrealLightmass.exe!Lightmass::FLightmassImporter::ImportObjectArray<Lightmass::FStaticMeshStaticLightingMesh,TMap<FGuid,Lightmass::FStaticMeshStaticLightingMesh * __ptr64,FDefaultSetAllocator,TDefaultMapKeyFuncs<FGuid,Lightmass::FStaticMeshStaticLightingMesh * __ptr64,0> > >() {0x00007ff6ca230d03} + 0 bytes
UnrealLightmass.exe!Lightmass::FScene::Import() {0x00007ff6ca2965b2} + 0 bytes
UnrealLightmass.exe!Lightmass::FLightmassImporter::ImportScene() {0x00007ff6ca2982d0} + 0 bytes
UnrealLightmass.exe!Lightmass::BuildStaticLighting() {0x00007ff6ca26299f} + 0 bytes
UnrealLightmass.exe!Lightmass::LightmassMain() {0x00007ff6ca29f3b8} + 0 bytes
UnrealLightmass.exe!main() {0x00007ff6ca2bd94f} + 0 bytes
UnrealLightmass.exe!__tmainCRTStartup() {0x00007ff6ca31950b} + 0 bytes
KERNEL32.DLL {0x00007ffa65f913d2} + 0 bytes
ntdll.dll {0x00007ffa67c65444} + 0 bytes
ntdll.dll {0x00007ffa67c65444} + 0 bytes