/public/../config/../vendor/rails/railties/lib/initializer.rb:271:in `require_frameworks': RubyGem version error: rack(1.0.0 not ~> 1.0.1) (RuntimeError) from /public/../config/../vendor/rails/railties/lib/initializer.rb:134:in `process' from /public/../config/../vendor/rails/railties/lib/initializer.rb:113:in `send' from /public/../config/../vendor/rails/railties/lib/initializer.rb:113:in `run' f