Fatal error: Call to undefined function add_action() in /var/www/pagemasters/public_html/wp-content/plugins/formidable/pro/formidable-pro.php on line 14

Call Stack:
    0.0002     665496   1. {main}() /var/www/pagemasters/public_html/wp-content/plugins/formidable/pro/formidable-pro.php:0