How to fix RVM gems "[ missing bin/ruby ]"

Question

After executing rvm list I get following output:

rvm rubies

   gems [ missing bin/ruby ]
=* ruby-2.0.0-p645 [ x86_64 ]
   ruby-2.1.6 [ x86_64 ]
   ruby-2.2.1 [ x86_64 ]

What does gems [ missing bin/ruby ] mean?

Is gems some kind of system gemset? It wasn't created by me and I don't know if I can, or should, remove it.

Answer 1

After I ran:

rvm fix-permissions

I was then able to uninstall versions that had [ missing bin/ruby ].