Database errors

[MJ Vincent]

Hello everyone. I am having an issue with privileges in MYSQL. I'm pretty new to it so be gentle. The problem I am having is trying to run a script and getting this error:

Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'mjvincent'@'localhost' (using password: YES) in C:\xampp\htdocs\lesson1\explain.php:17 Stack trace: #0 C:\xampp\htdocs\lesson1\explain.php(17): mysqli_connect('localhost', 'mjvincent', Object(SensitiveParameterValue), 'CustomerDatabas...') #1 {main} thrown in C:\xampp\htdocs\lesson1\explain.php on line 17

I thought this meant my password or username is incorrect so I have checked and rechecked and checked again. All information is correct. So what the heck? Somebody have an idea what this means?

Thanx