Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: NO) in /home/techacore/demo.techacore.in/billsoft/index.php:4 Stack trace: #0 /home/techacore/demo.techacore.in/billsoft/index.php(4): mysqli_connect('localhost', 'root', '', 'billingsoft') #1 {main} thrown in /home/techacore/demo.techacore.in/billsoft/index.php on line 4