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Exporting a Skeleton Mesh causes crash

I have a skeleton mesh .uasset file. Trying to export it causes the below error message and dev kit crash.


Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:F:\UE4\UnrealEngine\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 571] 
Array index out of bounds: 0 from an array of size 0

KERNELBASE.dll!UnknownFunction (0x00007fffac59a1c8) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e8c10a4) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e7d90a8) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e7a4d02) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007fff78fedb80) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007fff7900d7e4) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007fff7900d70f) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007fff78930578) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff711c9c81) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff711cb128) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007fff78a697e5) + 0 bytes [UnknownFile:0]
UE4Editor-ContentBrowser.dll!UnknownFunction (0x00007fff6a5db49e) + 0 bytes [UnknownFile:0]
UE4Editor-ContentBrowser.dll!UnknownFunction (0x00007fff6a5cee69) + 0 bytes [UnknownFile:0]
UE4Editor-ContentBrowser.dll!UnknownFunction (0x00007fff6a5dd7d7) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e26f566) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e276828) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e239b0f) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e3342fa) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e367312) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e28d46c) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fff7e279376) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e844349) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e82941b) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e8454c9) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e8248b2) + 0 bytes [UnknownFile:0]
USER32.dll!UnknownFunction (0x00007fffae8500dc) + 0 bytes [UnknownFile:0]
USER32.dll!UnknownFunction (0x00007fffae84fc07) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fff7e845986) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6105c9322) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6105bed0f) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6105bed7a) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6105cab40) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6105cba79) + 0 bytes [UnknownFile:0]
KERNEL32.DLL!UnknownFunction (0x00007fffacb02d92) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007fffaf0d9f64) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007fffaf0d9f64) + 0 bytes [UnknownFile:0]


Why has no one answered this?

Why has no one answered this?