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Q: 

Unknown gem rack >= 0 error

I keep getting this error message when trying to uninstall rack...

$ sudo gem uninstall rack
ERROR:  While executing gem ... (Gem::InstallError)
    Unknown gem rack >= 0

When I do gem list -l...

*** LOCAL GEMS***

rack (1.2.1, 1.1.0, 1.0.1)

Same error with gem uninstall rack (no sudo)

I've also tried gem uninstall rack --version 1.2.1 and I'm still getting the error.

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