I recently move my xenforo installation to a new server. I copied all files over and changed the config.php to reflect new database. I can log in fine as a normal user and everthing seems to work well. The problem is when i try to log in as admin I get the following error: Fatal error: Call to undefined function hash() in /myserverpath/httpdocs/library/XenForo/Authentication/Core.php on line 57 Any Ideas? Thanks for your help in advance.