Mannequin animation retargeting cause U4 Crash

Development Character & Animation
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1

Hi,
i have a project with only mannequin animation. I must migrate my character with mixamo skeleton.

When i create the retargeting (assigning the retarget Bones and moving the mannequin in T-pose) if try to retarget the animation Bluprint UE4 Crash.

If i try to retarget the single animation, the retarget is so bad (the hip bones is stucked) i tryed all type of combination with the “traslation retarget” but i don’t find solution.

Can you help me?
if exist a tool kit to make this automatically shoud be better.
Thank you in advance.

following the crash error:

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: 67 from an array of size 67

UE4Editor_Core
UE4Editor_Core
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_AssetTools
UE4Editor_AssetTools
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
user32
user32
UE4Editor_ApplicationCore
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll
2

This sounds to be a bug if you get this asset fail without touching C++, try to raport it wit detailed description how to reproduce it:

Also it can be helpful if you download engine debug symbols (in unreal instillation options), because that call stack you posted is useless without it and would give more light on what is happening