I can't debug Rails 3 project with RubyMine 3 RC

When trying to start the server for debugging I get the following:

Cannot connect to the debugged process at port 60557 in 10s:

Error Output:
/Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/gems/ruby-debug-base19-0.11.25.jb/lib/ruby-debug-base.rb:1:in `require': no such file to load -- ruby_debug.so (LoadError)
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/gems/ruby-debug-base19-0.11.25.jb/lib/ruby-debug-base.rb:1:in `<top (required)>'
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/gems/ruby-debug-ide-0.4.14/lib/ruby-debug-ide.rb:5:in `require'
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/gems/ruby-debug-ide-0.4.14/lib/ruby-debug-ide.rb:5:in `<top (required)>'
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/gems/ruby-debug-ide-0.4.14/bin/rdebug-ide:9:in `require_relative'
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/gems/ruby-debug-ide-0.4.14/bin/rdebug-ide:9:in `<top (required)>'
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/bin/rdebug-ide:19:in `load'
 from /Users/rsaucedo/.rvm/gems/ruby-1.9.2-preview3/bin/rdebug-ide:19:in `<top (required)>'
 from -e:1:in `load'
 from -e:1:in `<main>'