UE5.6 Crash on import

Hi, I’ve been importing characters fine into UE5.6 and have used both Live link and simply dragging in the character into UE5 with no problem but now all I get is the following crash:

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 1067] Array index out of bounds: 1 into an array of size 1.

I follow the correct import settings. It doesn’t work with a plain character with or animation. I have deleted the UE5 cache and have looked at various forums with regards to the above error.

I even recreated my character and I still get the crash. Could someone please help me understand why this has only just now started to happen? Thanks