problem making coppermine and wordpress1.5 work together

hi all, i have several problem having wordpress with coppermine to work together. i have upgrade wordpress 1.5 from 1.2 and downloaded the coppermine 1.3 from sourceforge. i ahve also downloaded the very cool scripts texx.org and i placed them exactly where it should be. they all work individually. i mean, i can upload pictures, i can still blog. but when i activate the coppermine plugin in wordpress and goto my website. it gives me this.

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.

* Are you sure you have the correct username and password?
* Are you sure that you have typed the correct hostname?
* Are you sure that the database server is running?

If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.

can anyone here give me a hand?
cheers,