Fatal error: Uncaught Error: Call to undefined function add_action() in /home/clmepl5/public_html/web/app/plugins/ninja-forms/lib/NF_VersionSwitcher.php:9 Stack trace: #0 /home/clmepl5/public_html/web/app/plugins/ninja-forms/lib/NF_VersionSwitcher.php(286): NF_VersionSwitcher->__construct() #1 {main} thrown in /home/clmepl5/public_html/web/app/plugins/ninja-forms/lib/NF_VersionSwitcher.php on line 9