Fatal error: Uncaught Error: Call to undefined method System::isAdmin() in /home/.sites/site3/wwwroot/web/source/sessions.php:24 Stack trace: #0 /home/.sites/site3/wwwroot/web/source/discounts.php(3): require_once() #1 /home/.sites/site3/wwwroot/web/stores/detailview.php(12): require_once('/home/.sites/si...') #2 {main} thrown in /home/.sites/site3/wwwroot/web/source/sessions.php on line 24