I am experiencing the same problems as described in this question (and the same as described in the questions that question links to): I received an invitation to create a profile on StackOverflow Careers 2.0, but after filling in all the details, I got the following error message:
Hmm, that email already exists on another account. You will need to log out of your existing account and log back in.
In the aforementioned questions the problems were solved manually by an administrator. Is it possible someone fixes this for me as well? Thanks.