Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: NO) in C:\mywamp\sites\allsite\Personal-Expense-Manager-master\Track_Expance-master\functions.php:12 Stack trace: #0 C:\mywamp\sites\allsite\Personal-Expense-Manager-master\Track_Expance-master\functions.php(12): mysqli->__construct('localhost', 'root', '', '') #1 C:\mywamp\sites\allsite\Personal-Expense-Manager-master\Track_Expance-master\index.php(2): include('C:\\mywamp\\sites...') #2 {main} thrown in C:\mywamp\sites\allsite\Personal-Expense-Manager-master\Track_Expance-master\functions.php on line 12