I am trying to fix the redirect issue once people register

Hi, I am trying to fix the redirect issue once people register using Facebook. How do I resolve it? It takes me to this link (a blank page):

https://m.facebook.com/dialog/registration?app_id=654574484625956&redirect_uri=https%3A%2F%2Fwww.facebook.com%2Fconnect%2Fwindow_comm.php%3F_id%3Df5fd048fc%26_relation%3Dopener

Do I need to do something on the Facebook app side or is this a plugin/wordpress issue? I went through all my settings under wordpress.