don't know where error is coming from

[roxystar13]

I'm getting the following error when I visit the main page of my gallery:

Coppermine critical error:
Unable to connect to database !

MySQL said: Access denied for user: 'fansites_derek@localhost' (Using password: YES)

It was working days ago but all of a sudden that came up!

I checked the config.inc.php file and all the database info is correct.

So why am I getting this error?
Where is it coming from?

All help will be very appreciated!

[Tranz]

If you have made no changes, maybe there's an issue with your webhost. They might be able to help.