Jotun
Fatal error: Uncaught Error: Call to undefined function extend_post_thumbnail() in /var/www/html/wp-content/themes/extend/template-parts/content-page.php:17 Stack trace: #0 /var/www/html/wp-includes/template.php(787): require() #1 /var/www/html/wp-includes/template.php(720): load_template() #2 /var/www/html/wp-includes/general-template.php(206): locate_template() #3 /var/www/html/wp-content/themes/extend/page.php(24): get_template_part() #4 /var/www/html/wp-includes/template-loader.php(106): include('...') #5 /var/www/html/wp-blog-header.php(19): require_once('...') #6 /var/www/html/index.php(17): require('...') #7 {main} thrown in /var/www/html/wp-content/themes/extend/template-parts/content-page.php on line 17