Fatal error: Uncaught Error: Call to undefined function add_action() in /home/anirqfxq/public_html/wp-content/plugins/gutenberg/lib/experimental/pages/site-editor.php:21 Stack trace: #0 {main} thrown in /home/anirqfxq/public_html/wp-content/plugins/gutenberg/lib/experimental/pages/site-editor.php on line 21