Fatal error: Uncaught Error: Call to undefined function is_main_site() in /home/mitche10/public_html/wp-includes/update.php:739 Stack trace: #0 /home/mitche10/public_html/wp-includes/version.php(1): include_once() #1 /home/mitche10/public_html/wp-settings.php(29): require('/home/mitche10/...') #2 /home/mitche10/public_html/wp-config.php(95): require_once('/home/mitche10/...') #3 /home/mitche10/public_html/wp-load.php(37): require_once('/home/mitche10/...') #4 /home/mitche10/public_html/wp-blog-header.php(15): require_once('/home/mitche10/...') #5 /home/mitche10/public_html/index.php(27): require('/home/mitche10/...') #6 {main} thrown in /home/mitche10/public_html/wp-includes/update.php on line 739