Not logging in the app

[sohrabzia]

I followed the steps but when i run the app it wont login.
in serviceURL.java file i am changing the url to
return "http://localhost:8881/Backend/LeaveManagement/"+url;

and my sql server is running, also the file at
http://localhost:8881/Backend/LeaveManagement/UserLogin.php throws error
Connection failed: Access denied for user 'root'@'localhost' (using password: NO)[{"response":"Failed"}]

but works when i use this query in RegistrationController.php line 21
$sqlQuery = "SELECT * FROM employee WHERE nic ='1'";

any help would be appreciated. thanks