Cant login more than one user Facebook Parse

Hi I'm using the Parse Login Ui to let the user log into the app with facebook. (http://ift.tt/1wyck9T) This is working nicely, however when the user logs out, and a different user tries to log in on the same device an error message is displayed, saying that the App is not correctly set-up. It is as if the App is hard coded to be used by only one user (the first one to use it).

Any ideas how to solve this problem would be appreciated.

Thanks a lot, Bart