Failed to Merge Bones ( Blender To Unreal )

Development Character & Animation
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1

I have been trying to import my rig I made in Blender to Unreal but no matter what I do it just keep saying, Failed to merge bones. I can’t find help on this anywhere.

https://www.google.com/search?q=Failed+to+Merge+Bones&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjGscXsgOLiAhUL2VkKHWckB68Q_AUIEigD&biw=1920&bih=888#imgrc=CCrNiem626D2uM: