Fatal error: Uncaught Error: Call to undefined function wp_body_open() in /htdocs/wp-content/plugins/wp-maintenance-mode/views/wpmm-page-template.php:17 Stack trace: #0 /htdocs/wp-includes/template-loader.php(74): include() #1 /htdocs/wp-blog-header.php(19): require_once('/htdocs/wp-incl...') #2 /htdocs/index.php(17): require('/htdocs/wp-blog...') #3 {main} thrown in /htdocs/wp-content/plugins/wp-maintenance-mode/views/wpmm-page-template.php on line 17