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On ACC12, as the initial user I was seeing the same message that you describe above. For me, when another user logs in and uses the feature it works fine for them. They can invite others etc. As the initial one setting up the site - I am still unable to invite others. That sure seems odd - but I am waiting to see something here or anywhere that confirms or denies whether this is the expected behavior or not. I expect that it is not.
I am really sorry that we missed this question!
This message will display until you republish your site and access your live site. Don't worry about it. The code has been installed correctly and the feature will work on your published site, but not in edit or preview mode.