Fatal error: Uncaught Error: Call to undefined function add_action() in /home/opzetweb/topcanvasfotos.opzet-website.nl/wp-content/themes/klasse-child-theme/functions.php:8 Stack trace: #0 {main} thrown in /home/opzetweb/topcanvasfotos.opzet-website.nl/wp-content/themes/klasse-child-theme/functions.php on line 8