ruby - Error install rubyracer with error "invalid gem: package is corrupt"

Question

When trying to install therubyracer on OSX 10.9, with the command:

$ gem install therubyracer -v '0.12.0'

I get the error:

ERROR:  Error installing therubyracer:
    invalid gem: package is corrupt, exception while verifying: undefined method `path2class' for #<Psych::ClassLoader:0x000001018cf210> (NoMethodError) in /Users/doved/.rvm/gems/ruby-2.0.0-p353/cache/therubyracer-0.12.0.gem

XCode developer tools are installed, and I've tried removing the cache file, but I still get the error.

Answer 1

Delete /Users/doved/.rvm/gems/ruby-2.0.0-p353/cache/therubyracer-0.12.0.gem and install the gem again. RubyGems didn't download the file properly, and the system is properly reporting that the gem is corrupted.