Fatal error: Uncaught Error: Call to undefined function add_action() in /home/workings/public_html/hidden/wp-content/plugins/ninja-forms/lib/NF_AddonChecker.php:7 Stack trace: #0 /home/workings/public_html/hidden/wp-content/plugins/ninja-forms/lib/NF_AddonChecker.php(49): NF_AddonChecker->__construct() #1 {main} thrown in /home/workings/public_html/hidden/wp-content/plugins/ninja-forms/lib/NF_AddonChecker.php on line 7