Too Geek To Be True

So, I was trying to run Webrick server for my Rails project on my work PC, and I got this error:
=> Booting Mongrel (use ’script/server webrick’ to force WEBrick)
=> Rails 2.1.1 application starting on 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
c:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/mongrel/tcphack.rb:
12:in `initialize_without_backlog’: Only one usage of each [...]