Fatal error: Uncaught Error: Call to undefined function is_main_site() in /home/customer/www/alaqar-live.com/public_html/wp-includes/update.php:873 Stack trace: #0 /home/customer/www/alaqar-live.com/public_html/wp-settings.php(215): require() #1 /home/customer/www/alaqar-live.com/public_html/wp-config.php(81): require_once('/home/customer/...') #2 /home/customer/www/alaqar-live.com/public_html/wp-load.php(37): require_once('/home/customer/...') #3 /home/customer/www/alaqar-live.com/public_html/wp-blog-header.php(13): require_once('/home/customer/...') #4 /home/customer/www/alaqar-live.com/public_html/index.php(17): require('/home/customer/...') #5 {main} thrown in /home/customer/www/alaqar-live.com/public_html/wp-includes/update.php on line 873