$ thor merb:gems:uninstall merb_helpers
/usr/local/lib/ruby/site_ruby/1.8/rubygems/open-uri.rb:101: warning: already initialized constant Options
/usr/local/lib/ruby/site_ruby/1.8/rubygems/open-uri.rb:355: warning: already initialized constant StringMax
/usr/local/lib/ruby/site_ruby/1.8/rubygems/open-uri.rb:416: warning: already initialized constant RE_LWS
/usr/local/lib/ruby/site_ruby/1.8/rubygems/open-uri.rb:417: warning: already initialized constant RE_TOKEN
/usr/local/lib/ruby/site_ruby/1.8/rubygems/open-uri.rb:418: warning: already initialized constant RE_QUOTED_STRING
/usr/local/lib/ruby/site_ruby/1.8/rubygems/open-uri.rb:419: warning: already initialized constant RE_PARAMETERS
Uninstalling merb_helpers...
/Users/jdempsey/.thor/28143251809e501e2e065b577b69a326:755:in `uninstall_gem': Failed to uninstall merb_helpers (Merb::GemUninstallError)
        from /Users/jdempsey/.thor/28143251809e501e2e065b577b69a326:541:in `uninstall'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/task.rb:20:in `send'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/task.rb:20:in `run'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/task.rb:13:in `parse'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/runner.rb:138:in `method_missing'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/task.rb:20:in `send'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/task.rb:20:in `run'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor/task.rb:13:in `parse'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/lib/thor.rb:70:in `start'
        from /usr/local/lib/ruby/gems/1.8/gems/thor-0.9.6/bin/thor:7
        from /usr/local/bin/thor:19:in `load'
        from /usr/local/bin/thor:19