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.