WARNINGS BRO

[ROHITHMN5783]

Undefined variable $HostelID in C:\xampp\htdocs\3\includes\hm_signup.php on line 49

Warning: Undefined variable $HostelID in C:\xampp\htdocs\3\includes\hm_signup.php on line 49

Fatal error: Uncaught mysqli_sql_exception: Cannot add or update a child row: a foreign key constraint fails (hostel_management_system.hostel_manager, CONSTRAINT Hostel_Manager_ibfk_1 FOREIGN KEY (Hostel_id) REFERENCES hostel (Hostel_id)) in C:\xampp\htdocs\3\includes\hm_signup.php:50 Stack trace: #0 C:\xampp\htdocs\3\includes\hm_signup.php(50): mysqli_query(Object(mysqli), 'INSERT INTO Hos...') #1 {main} thrown in C:\xampp\htdocs\3\includes\hm_signup.php on line 50

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 200

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 204

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 200

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 204

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 200

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 204

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 200

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\3\admin\students.php on line 204

BRO PLS TELL ME ...I WANT IT ASAP PLS