Bone Disappearing After Import

I’m working on my game, and I made an AK74 ViewModel:

The issue is that when I import the rig into my game, I get a bunch of descendant errors on all the gun’s bones:
image

And the bones disappear from the game after clicking import:
image
(Caption: Where did they go?)
I have horrible writing with a mouse

It does this to any sort of ViewModel I’ve made too!

Blender File:
Error.blend (4.2 MB)

Please help!

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