Fatal error: Uncaught Error: Call to undefined function App\add_action() in /home/k1799/dev.studiohamerhaai.nl/wp-content/themes/hamerhaai/app/ajax.php:16 Stack trace: #0 /home/k1799/dev.studiohamerhaai.nl/wp-content/themes/hamerhaai/app/ajax.php(76): App\Ajax->__construct() #1 {main} thrown in /home/k1799/dev.studiohamerhaai.nl/wp-content/themes/hamerhaai/app/ajax.php on line 16