Error: Permission denied for <http://zbar.zynga.com> (document.domain has not been set) to call method Location.toString on <http://apps.facebook.com> (document.domain=<http://facebook.com>). while trying to play mafia wars on facebook, I am unable to click on link. when I check for "errors", I get this response... Error: Permission denied for <http://zbar.zynga.com> (document.domain has not been set) to call method Location.toString on <http://apps.facebook.com> (document.domain=<http://facebook.com>). I have the same problem.