Mannequin does not work in Maya 2013

I am using Maya 2013 and am trying to add the A.R.T. mannequin into my scene but when I click to “add character for animation” it tells me “Error: there are no characters in scene, add characters now?” When I click yes, nothing happens. If I do the same thing with a sample rig I create in UE4 it works just fine, but I need the mannequin specifically for a project. Also clicking on edit export rig does nothing as well. Any help is appreciated. Thanks!

When you click “Add character for animation” do you get the UI window at least?

ressurecting because i have the same exact issue.