Fatal error: Uncaught mysqli_sql_exception: Cannot delete or update a parent row: a foreign key constraint fails (`msh373ict301`.`section`, CONSTRAINT `section_ibfk_3` FOREIGN KEY (`classroom_id`) REFERENCES `classroom` (`id`)) in /var/www/html/ict301/201/msh373/Final project/delete_classroom.php:6 Stack trace: #0 /var/www/html/ict301/201/msh373/Final project/delete_classroom.php(6): mysqli_query() #1 {main} thrown in /var/www/html/ict301/201/msh373/Final project/delete_classroom.php on line 6