XAMPP WORNIG this is my index.php file

Question

please sir i used my index.php , login.php, logout.php, welcome.php delete.php admin_login.php view_user.php delete.php db_connection_php so in the end the system shows thos error message

 

 Warning: include(database/db_conection.php): failed to open stream: No such file or directory in C:\xampp\htdocs\student_login\registration.php on line 54

Warning: include(): Failed opening 'database/db_conection.php' for inclusion (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\student_login\registration.php on line 54