I keep getting the error:

LoginId:1978d23c4c338d46283e3c999ce73661 EpicAccountId:4036e797f1d047eba2e8cc9c84c55e1e

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 614] Array index out of bounds: 0 from an array of size 0

UE4Editor_Core UE4Editor_Core UE4Editor_MeshBuilder UE4Editor_MeshBuilder UE4Editor_MeshBuilder UE4Editor_MeshBuilder UE4Editor_UnrealEd UE4Editor_UnrealEd UE4Editor_UnrealEd UE4Editor_AssetTools UE4Editor_AssetTools UE4Editor_UnrealEd UE4Editor_UnrealEd UE4Editor_Engine UE4Editor_Engine UE4Editor_UnrealEd UE4Editor_UnrealEd UE4Editor UE4Editor UE4Editor UE4Editor UE4Editor kernel32 ntdll

every time i try to port my skeletal mesh to it. I've messed with the smoothing groups, the UVs, and some of the import options in Unreal to no avail. Any ideas?

Blender Export Settings:

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Unreal Import Settings:

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