Redcar conflict netbeans


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
from my local machine(ubuntu 10.10)

when I put this in console:

sudo gem uninstall redcar

I got

WARNING: Invalid .gemspec format in
ERROR: While executing gem … (Gem::InstallError)
cannot uninstall, check gem list -d redcar

so how can I uninstall redcar


Thanks in Advance


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