Fatal error: Uncaught Error: Call to undefined function plugin_dir_path() in /home/workings/public_html/hidden/wp-content/plugins/ninja-forms/includes/Libraries/BackgroundProcessing/wp-background-processing.php:19 Stack trace: #0 {main} thrown in /home/workings/public_html/hidden/wp-content/plugins/ninja-forms/includes/Libraries/BackgroundProcessing/wp-background-processing.php on line 19