Fatal error: Uncaught Error: Call to undefined function add_action() in /home/nagorskakamila/public_html/knagbezp/wp-content/themes/spacious/inc/admin/meta-boxes.php:10 Stack trace: #0 {main} thrown in /home/nagorskakamila/public_html/knagbezp/wp-content/themes/spacious/inc/admin/meta-boxes.php on line 10