Does anyone know how to fix this problem?
LogUnrealMath:Error: FMatrix::Inverse(), trying to invert a NIL matrix, this results in NaNs! Use InverseSafe() instead.
LogOutputDevice: === Handled error: ===
Ensure condition failed: false [File:d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\core\public\math\UnrealMatrix.h] [Line: 268]
FMatrix::Inverse(), trying to invert a NIL matrix, this results in NaNs! Use InverseSafe() instead.
Stack: Address = 0xe9635216 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0xe94c19d1 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0xe94c1c17 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0xe6e6472b (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Engine.dll]
Address = 0xe7ac53df (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Engine.dll]
Address = 0xe7acb227 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Engine.dll]
Address = 0xe7acb610 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Engine.dll]
Address = 0xe2cf2039 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Renderer.dll]
Address = 0xe2ce83f3 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Renderer.dll]
Address = 0xe2d0874c (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Renderer.dll]
Address = 0xe2ba5360 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Renderer.dll]
Address = 0xe2d20834 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Renderer.dll]
Address = 0xe2cf6972 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Renderer.dll]
Address = 0xe93f7002 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0xe93f718d (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0xf6c8c353 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-RenderCore.dll]
Address = 0xf6c8c7e9 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-RenderCore.dll]
Address = 0xe9632ca6 (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0xe962c26d (filename not found) [in C:\Program Files\Epic Games\4.4\Engine\Binaries\Win64\UE4Editor-Core.dll]
Address = 0x15616ad (filename not found) [in C:\Windows\system32\KERNEL32.DLL]
Address = 0x36e4409 (filename not found) [in C:\Windows\SYSTEM32\ntdll.dll]
Address = 0x36e4409 (filename not found) [in C:\Windows\SYSTEM32\ntdll.dll]