A bunch of warning notices

[tottebias]

I get this everytime i upload a document:
warning: Parameter 2 to notifications_team_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to purl_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to spaces_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to atrium_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to atrium_book_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to casetracker_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to date_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to date_timezone_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to og_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to og_access_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to atrium_folders_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.
warning: Parameter 2 to notifications_content_form_alter() expected to be a reference, value given in /var/www/dox/includes/common.inc on line 2892.

Any idea what this could be?