lightmass build crash

Development Rendering
1

Any idea how to fix this?

<None> === Lightmass crashed: ===
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\Containers/Array.h] [Line: 610]
Array index out of bounds: 44 from an array of size 44

0x00000000DB1EA1A8 KERNELBASE.dll!UnknownFunction ]
0x0000000052AC5E24 UnrealLightmass-ApplicationCore.dll!UnknownFunction ]
0x000000004FA9A48B UnrealLightmass-Core.dll!UnknownFunction ]
0x000000004F9DD248 UnrealLightmass-Core.dll!UnknownFunction ]
0x0000000015B7D81A UnrealLightmass.exe!UnknownFunction ]
0x0000000015B87734 UnrealLightmass.exe!UnknownFunction ]
0x0000000015BDF96A UnrealLightmass.exe!UnknownFunction ]
0x0000000015B8DE64 UnrealLightmass.exe!UnknownFunction ]
0x0000000015BB6D23 UnrealLightmass.exe!UnknownFunction ]
0x0000000015BD5D4A UnrealLightmass.exe!UnknownFunction ]
0x0000000015C51F35 UnrealLightmass.exe!UnknownFunction ]
0x00000000DEA22784 KERNEL32.DLL!UnknownFunction ]
0x00000000DEC80D51 ntdll.dll!UnknownFunction ]
0x00000000DEC80D51 ntdll.dll!UnknownFunction ]

2

have you found/got a solution to this? I’ve had the same problem recently.

3

OK - found the solution by searching in this Forum. Here you can find it:

https://forums.unrealengine.com/development-discussion/architectural-and-design-visualization/1446716-please-help-what-happen-lightmass-crash