I have set up the app in Twitter and have the app key and secret key. I added these to the XF control panel and the Twitter button appears. When I click on the Twitter button, I get the following error. "An unexpected error occurred. Please try again later" When clicking the button it redirests to mydomain.com/register/twitter?reg=1 where i get the above error. What should I put in the Twitter app Call back Url? I only added mydomain.com thinking that would be ok. Any ideas?