Fatal error: Uncaught Error: Call to undefined function is_main_site() in /home/exactt6/docs.exactthemes.com/docs.exactthemes.com/wp-includes/update.php:1152
Stack trace:
#0 {main}
thrown in /home/exactt6/docs.exactthemes.com/docs.exactthemes.com/wp-includes/update.php on line 1152