Error in Software Sources 404 Not Found

Question

Possible Duplicate:
How can I fix a 404 Error using a PPA?

I get an error while using aptitude update:

Err http://ppa.launchpad.net maverick/main Sources              
404  Not Found

Err http://ppa.launchpad.net maverick/main i386 Packages           
404  Not Found

What do i do to fix this?