Failing plugins discover

I wanted to install some plugins to Rails, and I was surprised with following errors: [SOME SITES WITH PLUGINS] (eval):3:in `each’: undefined method `[]’ for nil:NilClass (NoMethodError) from /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/plugin.rb:658:in `scrape’ from /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/plugin.rb:632:in `parse!’ from /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/plugin.rb:631:in `parse!’ from /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/plugin.rb:447:in `parse!’ from /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/plugin.rb:463:in `parse!’ from /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/plugin.rb:871 from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require’ from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require’ from ./script/plugin:3 What the heck? […]