Fatal error: Uncaught Error: Call to undefined function add_action() in /home/refref/public_html/codemirror/wp-post-to-pdf-enhanced-cache/knowhow/functions.php:56 Stack trace: #0 {main} thrown in /home/refref/public_html/codemirror/wp-post-to-pdf-enhanced-cache/knowhow/functions.php on line 56