Invite join url not valid

Folks,
Did I miss something? I've read everything I can find including the readme, the documentation link, and everything I could finnd in the forums, but can't find any mention of setting up the registration page. I'm new to Drupal so if its a configuraiton I've missed its not in the readme or anywhere else that I can find.

The issue is that everything looks to be working correctly/well except that the invitaiton emails state to click on the following link: http://mysite.com/drupal1/invite/accept/--invite-code-- (the user sees an actual invite code this is just from the template).

But clicking on this link, while taking them to our site, returns a "page not found" error. Where is this page defined?

Thanks,
KWL