ruby on rails - Aptana3.4.0 Ruby2 on Rails4, cannot "Run Server", why? osx 10.8.4 -

i created new "rails project" aptana(3.4.0), cannot "run server", aptana doesn't response @ all, why? ruby version 2.0.0p195, rails version rails 4.0.0.rc1, on mac osx 10.8.4. can help?

i encountered similar problem , solved copying (project_folder)/bin/rails new folder (project_folder)/script