Problem with gem update.

Im trying to update my gems with

sudo gem update --system

and im getting this error.

Updating RubyGems WARNING: RubyGems 1.2+ index not found for:   http://merbivore.com

RubyGems will revert to legacy indexes degrading performance. Updating metadata for 120 gems from http://gems.rubyforge.org/ ........................................................................................................................ complete ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)     bad response Not Found 404 (http://merbivore.com/Marshal.4.8)

What do i have to do fix this and complete an update? Why is it giving me that merbivore reference?

Hi,