Fix - Facebook profile application tab blank page

I think many new Facebook application developers face this problem. You do all the steps instructed in a book or the documentation and you still get a blank page for the profile tab. Yeah I know the feeling, It sucks big time, This error almost made me stop learning about Facebook app development.
After hours of searching and experimenting I found the solution for my problem.

Solution for my problem:

Canvas Callback URL should have a trailing /
Ex:
Canvas Callback URL: http://xxxxxx.joyent.us/

If you are using http://yourdomain/index.php just remove index.php since it will be loaded in default.