Fatal error: Uncaught Error: Call to undefined function app() in /var/www/vhosts/elastic-noyce.146-255-58-43.plesk.page/httpdocs/web/app/themes/galleria/index.php:20 Stack trace: #0 /var/www/vhosts/elastic-noyce.146-255-58-43.plesk.page/httpdocs/web/wp/wp-includes/template-loader.php(106): include() #1 /var/www/vhosts/elastic-noyce.146-255-58-43.plesk.page/httpdocs/web/wp/wp-blog-header.php(19): require_once('...') #2 /var/www/vhosts/elastic-noyce.146-255-58-43.plesk.page/httpdocs/web/index.php(6): require('...') #3 {main} thrown in /var/www/vhosts/elastic-noyce.146-255-58-43.plesk.page/httpdocs/web/app/themes/galleria/index.php on line 20