How do I handle an error that indicates a RubyGem could not be found?
If you don’t successfully install dependent packages before you install the packages that require them, you’ll get an error message such as could not find RubyGem rake (>= 0.6.2)(Gem::LoadError). The first line of the error lists the dependent package and the version required (rake 0.6.2 or above in the example). Install the dependent package and then reinstall.