Yeah, so I think this is a server config issue.
If you look at http://mydomain.om/admin.php?tools/phpinfo
You should find a configuration line: session.save_path
From the error, I'm expecting the path to be listed as:
/var/lib/php5
It seems the permissions aren't set correctly on this folder for PHP sessions so I would contact your host or seek advice for adjusting the value yourself.
session_start is a pretty standard PHP function.
If you look at http://mydomain.om/admin.php?tools/phpinfo
You should find a configuration line: session.save_path
From the error, I'm expecting the path to be listed as:
/var/lib/php5
It seems the permissions aren't set correctly on this folder for PHP sessions so I would contact your host or seek advice for adjusting the value yourself.
session_start is a pretty standard PHP function.