Fatal error: Uncaught mysqli_sql_exception: Unknown database 'project01' in W:\domains\openserver\project\includes\functions\database.php:26 Stack trace: #0 W:\domains\openserver\project\includes\functions\database.php(26): mysqli_real_connect() #1 W:\domains\openserver\project\includes\application_core.php(266): db_connect() #2 W:\domains\openserver\project\includes\application_top.php(20): require('W:\\domains\\open...') #3 W:\domains\openserver\project\index.php(3): require('W:\\domains\\open...') #4 {main} thrown in W:\domains\openserver\project\includes\functions\database.php on line 26