So you just installed Pancake, typed yourdomain.com/pancake into the address bar and hit enter, only to see this screen.
Oops. Simply add /admin to the end of your address e.g. yourdomain.com/pancake/admin
There's a chance you aren't using the normally hidden .htaccess file that comes with Pancake. In that case, your address will be yourdomain.com/pancake/index.php/admin
You should now be able to log in to Pancake!