Fatal error: Uncaught Error: Call to undefined function wp_using_themes() in /public_html/wp-includes/template-loader.php:7 Stack trace: #0 /public_html/wp-blog-header.php(19): require_once() #1 /public_html/index.php(17): require('/public_html/wp...') #2 {main} thrown in /public_html/wp-includes/template-loader.php on line 7