I recently installed Rails 3 beta release but I needed to create new app with the 2.3.5. version. I was searching for a way to do that and I found this

  rails _2.3.5_ appname

Unfortunately this will produce an error similar to this

  /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:827:in `report_activate_error': RubyGem version error: railties(3.0.0.beta not = 2.3.5) (Gem::LoadError)
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:261:in `activate'
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:68:in `gem'
	from /usr/local/bin/rails3:18

To fix this first run

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