How can I animate 2 puppets on one Character Animator project? ?

I created a psd file with 2 puppets(with the right groups; like you would with 1 puppet) and I had a background as well. But after I rigged both puppets, it wouldn't add it to a scene, it gave an error. 

I want to puppets to walk side by side in front of a background while they are talking to one another, can I do this in Character Animator or After Effects? 

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