Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/pubconcom/public_html/wp-content/plugins/wcfm-marketplace-rest-api/helpers/wcfmapi-core-functions.php:13 Stack trace: #0 {main} thrown in /home/pubconcom/public_html/wp-content/plugins/wcfm-marketplace-rest-api/helpers/wcfmapi-core-functions.php on line 13