I have just enabled the hyper cache plugin on my blog then it showed an error which asked for some editing in config.php. But by mistake i made the changes in config file of wordpress v 2.6 and uploaded on the server and by then I am getting the Error establishing a database connection and This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at localhost. This could mean your host’s database server is down. I am having the latest version of wordpress on my blog and also automatic upgrade plugin. Pls help to resolve the issue.