# Error while starting rails over "ruby script/server" **URL:** \ **Category:** Deployment\ **Created:** [February 27, 2009, 7:53pm UTC](https://www.ruby-forum.com/t/error-while-starting-rails-over-ruby-script-server/161607 "2009-02-27T19:53:49Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![thearchitect](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/5e9695/32.png) [@thearchitect](https://www.ruby-forum.com/u/thearchitect)\ **Post date:** [February 27, 2009, 7:53pm UTC](https://www.ruby-forum.com/t/error-while-starting-rails-over-ruby-script-server/161607/1 "2009-02-27T19:53:49Z")
I am very new to Ruby on Rails, but also very excited to get those things started. I downloaded and installed “BitNami RubyStack Stack 1.4-beta-1” which includes all necessary tools for running RoR offline under OS X (10.5). I tried to get it started before in some other different ways, but I never got it, because I am very new to this. Finally now I tried to start my rails app, but then something strange happened. In my web browser should [http://localhost:3000](http://localhost:3000) open my active rails application, but there’s only following error message: Status: 500 Internal Server Error Content-Type: text/html Application error (Rails) So I tried to start the rails app over the Terminal. I changed to my railsapp-folder and entered: “ruby script/server” which should start Mongrel for my railsapp. But the Terminal showed me: =\> Booting Mongrel (use ‘script/server webrick’ to force WEBrick) =\> Rails 2.2.2 application starting on [http://0.0.0.0:3000](http://0.0.0.0:3000) =\> Call with -d to detach =\> Ctrl-C to shutdown server \*\* Starting Mongrel listening at 0.0.0.0:3000 Exiting /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/tcphack.rb:12:in `initialize_without_backlog': Address already in use - bind(2) (Errno::EADDRINUSE) from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/tcphack.rb:12:in `initialize’ from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:93:in `new' from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:93:in `initialize’ from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:139:in `new' from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:139:in `listener’ from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/bin/mongrel\_rails:99:in `cloaker_' from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:50:in `call’ from /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:50:in `initialize' ... 14 levels... from /Library/Ruby/Gems/1.8/gems/rails-2.2.2/lib/commands/server.rb:49 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem\_original\_require’ from /Library/Ruby/Site/1.8/rubygems/custom\_require.rb:31:in `require’ from script/server:3 It says, that the localhost-address is already in use, but I have no idea how I can reset it. Can somebody help me with this problem? Greetz, Marcel ---
**Author:** ![thearchitect](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/5e9695/32.png) [@thearchitect](https://www.ruby-forum.com/u/thearchitect)\ **Post date:** [March 6, 2009, 3:37am UTC](https://www.ruby-forum.com/t/error-while-starting-rails-over-ruby-script-server/161607/2 "2009-03-06T03:37:14Z")
> It says, that the localhost-address is already in use, but I have no > idea how I can reset it. > Can somebody help me with this problem? > > Greetz, > Marcel Marcel, This may help you open terminal type ps ax toward the bottom of what it spits out it there will be something like: 482 p1 S+ 0:16.45 ruby script/server type kill and then the first number ( in this case it was 482 ) like this: kill 482 Then try and restart using ruby script/server command from your terminal.