(please share the FULL error message you see, if applicable)
General Error
Illegal use of $_SERVER. You must use the request class to access input data. Found in /var/www/errors/override.php on line 56. This error message was generated by deactivated_super_global.
BACKTRACE
FILE: (not given by php)
LINE: (not given by php)
CALL: msg_handler()
The /var/www/errors/override.php file is PHP code that we inject into every request. Some commonly used PHP functions are disabled on our hosting, so we inject our own implementations or stubs to allow websites to use those functions even though the “real” version is not enabled.
However, our overrides use superglobals, which phpBB doesn’t like.
I haven’t seen the code so I don’t know if our code can easily be updated to remove this dependency. But this guide says that phpBB has a setting core.disable_super_globals that can be set to false to remove this check:
[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/filesystem/filesystem.php on line 835: is_link(): open_basedir restriction in effect. File(/home) is not within the allowed path(s): (/php_sessions:/tmp:…:/var/www/errors:/usr/share/pear:/home/vol13_2/freecluster.eu/fceu_18338360/sebul.sarang.net/htdocs)
[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/filesystem/filesystem.php on line 872: is_dir(): open_basedir restriction in effect. File(/home/) is not within the allowed path(s): (/php_sessions:/tmp:…:/var/www/errors:/usr/share/pear:/home/vol13_2/freecluster.eu/fceu_18338360/sebul.sarang.net/htdocs)
[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/filesystem/filesystem.php on line 877: is_file(): open_basedir restriction in effect. File(/home) is not within the allowed path(s): (/php_sessions:/tmp:…:/var/www/errors:/usr/share/pear:/home/vol13_2/freecluster.eu/fceu_18338360/sebul.sarang.net/htdocs)
Other Information
(other information and details relevant to your question)