Just downloaded fresh copy of latest Xenforo. Followed installation instructions, uploaded to server. CHMOD'd 'data' and 'internal_data' to 777. Browsed to installation folder to start the installation and immediately got the following error message. (Actual domain name replaced for purposes of this thread) Fatal error: require(): Failed opening required '/homepages/16/d41542564/htdocs/'domain name'/discussion/library/XenForo/Autoloader.php' (include_path='.:/usr/lib/php5.4') in /homepages/16/d41542564/htdocs/'domain name'/discussion/install/index.php on line 8 I've had a search but can find nothing relating to this error message. I'm using 1&1 internet as a host if that's any help. PHP version is 5.5 MYSQL5 Such a shame having decided to move to this from Vbulletin and just paid up for it and hit a hurdle at the first stage. Any help on this would be greatly appreciated.