Can't switch from Facebook login to IMDb login

I created an account with Facebook but can't login via Facebook (different account than I'm posting this with) so I tried entering my email associated with my Facebook account to change to an IMDb account, but it just gave an error saying "There was a problem We're sorry. We weren't able to identify you given the information provided." I really want to recover my account since I've rated many movies but at the moment am not able to login or switch the account away from Facebook.