Fatal error: Uncaught Error: Object of class PDOStatement could not be converted to string in /opt/app-root/src/public/includes/classroom_display.php:75 Stack trace: #0 /opt/app-root/src/public/index.php(390): include_once() #1 {main} thrown in /opt/app-root/src/public/includes/classroom_display.php on line 75