Fatal error: Uncaught Error: Call to undefined function add_action() in /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/gravitysleep/wp-content/plugins/divi-booster/core/hooks/action-db_admin_css.php:10 Stack trace: #0 /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/gravitysleep/wp-content/plugins/divi-booster/core/hooks/index.php(6): include_once() #1 /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/gravitysleep/wp-content/plugins/divi-booster/core/index.php(5): include('/var/www/vhosts...') #2 {main} thrown in /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/gravitysleep/wp-content/plugins/divi-booster/core/hooks/action-db_admin_css.php on line 10