http://weblog.rubyonrails.org/2008/6/1/rails-2-1-t... # hrisff on 24 Jun 06:02: Anyone else getting this? $ sudo gem install rails ERROR: Error installing rails: invalid gem format for /usr/local/lib/ruby/gems/1.8/cache/activesupport-2.1.0.gem 2.0.2 is installed and working. Using gem v1.2.0 on Leopard deleting the cached gem and retrying doesn’t help. # pentor on 24 Jun 14:45: Same problem here as chrisff also today… could it be a bug in that file or in the repository? # Vincenzo Acinapura on 24 Jun 15:08: Same problem here, I’ve installed rubygems 1.2.0 and ruby 1.8.7-p22. When I try to install rails, I get “invalid gem format for /usr/local/ lib/ruby/gems/1.8/cache/activesupport-2.1.0.gem” # JoeTheIntern on 24 Jun 16:12: Exact problem as chris, pentor and Vince – it was driving me crazy. Deleting the cache did not help – the gem magically reappears each time. I managed to install ActiveSupport 2.1.0 by downloading from its rubyforge project page manually and installing locally, and then “gem install rails” goes through just fine. Looks like a bad repository version to me. Was upgrading from Rails 1.2.3 on Vista, using RubyGems 1.2. # TomH on 24 Jun 19:21: I used @JoeTheIntern’s instructions and was able to resolve the problem. http://rubyforge.org/projects/activesupport/ Download gem to a local file, then sudo gem install—local activesupport-2.1.0.gem All fixed. Thanks Joe!
on 2008-06-24 22:32
on 2008-08-18 19:05
I found that the problem was using gems.github.com as one of the source repositories. once i removed it, and cleaned out the cache directory, things worked fine.