Fatal error: Uncaught Error: Call to undefined function add_filter() in /var/www/html/olympiads/wp-content/plugins-tmp-06-2023/gutenberg/lib/compat/wordpress-6.1/wp-theme-get-post-templates.php:44 Stack trace: #0 {main} thrown in /var/www/html/olympiads/wp-content/plugins-tmp-06-2023/gutenberg/lib/compat/wordpress-6.1/wp-theme-get-post-templates.php on line 44