Ruby gem error installing rack-mount + Rails
ruby, ruby-on-rails, ruby-on-rails-3
Solution
As noted in the comments here, you need `rack-mount` at exactly version 0.4.0. Install with the following command:
gem install rack-mount -v 0.4.0
Problem
I would like to install Rails 3.0 Beta but ran into what appears to be a dependency error: ``` $: sudo gem install rack-mount Successfully installed rack-mount-0.5.1 1 gem installed Installing ri documentation for rack-mount-0.5.1... Installing RDoc documentation for rack-mount-0.5.1... $: sudo gem install rails --prerelease ERROR: Error installing rails: actionpack requires rack-mount (~> 0.4.0, runtime) ``` Why is it unable to recognize that rack-mount is already installed?