HI, I'm having problems after I upgrade from Splatiff to PHPBB. I got this error messages:

ERROR
There was a theme mismatch between the site and the forum themes - No changes made


When I created a new user and login, it won't allow me to change the themes. Can someone assist me on this? I'm kind of confuse which themes is for PHP Site or PHPBB board. You can test my page by going to: http://64.142.6.117


Thank,