LoadError: RubyGem version error: rake-compiler(0.6.0 not

Just ran across this thread. I was having a similar problem with
RubyGem version error: rake-compiler(0.6.0 not ~> 0.5.0) and was able
to solve the issue by doing this...

gem uninstall rake-compiler -v 0.6.0

gem install rake-compiler -v 0.5.0

Hope this helps.
~D

Everything