Mesh must have Armature modifier assigned.

Do not import qcs. Import meshes and animations separately.

Hands are imported as separate mesh+armature, then bone constrained to knive v_ model

Duplicate mesh. Apply shape key. Export.

Import smd instead

>the name of objects contain unicode characters and may not compile correctly

Export it

Make weapon_bone as child of r_hand for now
https://drive.google.com/file/d/1ObAn2lF-bM2kWyyGn483mMOqE-r1i1PC/view?usp=sharing

Getting same error on Steam version.
To reproduce, import only animation file as new object. Appending the animations onto mesh makes it still un-animated.

>it has no armature modifier or vertex groups.
Don't need of them, meshes are parented to bones instead.