redcar conflict netbeans

Hi

   I had a IDE netbeans now I have installed red car but after
installing redcar my NETBEANS not working so I want to remove redcar

when I put this in console:

sudo gem uninstall redcar

I got

WARNING: Invalid .gemspec format in
'/usr/lib/ruby/gems/1.8/specifications/redcar-0.13.gemspec'
ERROR: While executing gem ... (Gem::InstallError)
    cannot uninstall, check `gem list -d redcar`

so how can I uninstall redcar

PLEASE HELP

Thanks in Advance

Kausik