Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/cedarrapidscsd/sites/cedarrapids/releases/20220518171300/web/app/plugins/gutenberg/lib/full-site-editing/page-templates.php:29 Stack trace: #0 {main} thrown in /home/cedarrapidscsd/sites/cedarrapids/releases/20220518171300/web/app/plugins/gutenberg/lib/full-site-editing/page-templates.php on line 29