Fatal error: Uncaught Error: Call to undefined function wp_using_themes() in /var/www/juniorki/wp-includes/template-loader.php:31
Stack trace:
#0 /var/www/juniorki/wp-blog-header.php(19): require_once()
#1 /var/www/juniorki/index.php(3): require('/var/www/junior...')
#2 {main}
thrown in /var/www/juniorki/wp-includes/template-loader.php on line 31