My previous definition of the solution I applied was wrong. I had to re-install "OsTicket" again (wonderful system I've found) and the way to avoid the error message is accesing directly to the php file, I mean:a.- For final user access, instead of: "www.YourDomain.com/HelpDesk" I have to call "www.YourDomain.com/HelpDesk/index.php".b.- For staff access, instead of "www.YourDomain.com/HelpDesk", I have to call "www.YourDomain.com/HelpDesk/scp/settings.php".I don't know the reason but it works.Regrettably I use a shared hosting service and I don't have access to the php error log.Thanks