Install Rails Error “invalid gem: package is corrupt”

Question

I am running Mac OSX 10.9.1 and I am using RVM to manage Ruby v2.0.0-p353.

When I try to install Rails I get this error:

Ryans-MacBook-Air-2:~ ryan$          


        

Answer 1

The latest version no longer has the class2path method so the problem can be avoided by downgrading the Psych gem to version 2.0.0:

gem list psych   # note down latest version
gem uninstall psych -v 2.0.5  # or whatever version you have installed

After the gems are installed you can upgrade the Psych gem again should you need it.