Help with uploading rigged mesh from demo

There's a demo rigged mesh that I exported using hydrastorm and

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on exporting rigged and Bento mesh.

However, when I try to upload the dae, I get the "Material of model is not a subset of reference model" error. Because the root prim is the demo box floating above the head

As suggested by a user in the thread, I imported and exported via blender, but now the object is rigged to the hand.

A little trouble shooting would be appreciated. Thank you.