Fatal error: Uncaught Error: Call to undefined function wp_using_themes() in /nfs/aesop1/dw00/d25/xsp/wordpress/wp-includes/template-loader.php:7
Stack trace:
#0 {main}
thrown in /nfs/aesop1/dw00/d25/xsp/wordpress/wp-includes/template-loader.php on line 7