Fatal error: Uncaught mysqli_sql_exception: Unknown database 'employee_card_db' in C:\xampp\htdocs\TC\id\New folder\V1 - Copy\db.php:7 Stack trace: #0 C:\xampp\htdocs\TC\id\New folder\V1 - Copy\db.php(7): mysqli->__construct('localhost', 'root', Object(SensitiveParameterValue), 'employee_card_d...') #1 C:\xampp\htdocs\TC\id\New folder\V1 - Copy\index.php(1): require('C:\\xampp\\htdocs...') #2 {main} thrown in C:\xampp\htdocs\TC\id\New folder\V1 - Copy\db.php on line 7