When I run cleanup I get an error

yadav@K64x2:$ sudo gem cleanup
Cleaning up installed gems...
Attempting to uninstall rack-1.0.0
ERROR:  While executing gem ... (Gem::InstallError)
     Unknown gem rack = 1.0.0

How can I fix this? I am told I have rack (1.0.1, 1.0.0) install.

-- 
Kind Regards,
Rajinder Yadav

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