upgrading problems, 2.3.5 -> 2.3.8

Ever since I updated rails to 2.3.8, script/server exits right after it
Here's the output

=> Ctrl-C to shutdown server
[2010-05-29 18:14:58] INFO WEBrick 1.3.1
[2010-05-29 18:14:58] INFO ruby 1.9.1 (2009-01-30) [i686-linux]
[2010-05-29 18:14:58] WARN TCPServer Error: Address already in use -
/usr/local/lib/ruby/1.9.1/webrick/utils.rb:73:in `initialize': Address
already in use - bind(2) (Errno::EADDRINUSE)
  from /usr/local/lib/ruby/1.9.1/webrick/utils.rb:73:in `new'
  from /usr/local/lib/ruby/1.9.1/webrick/utils.rb:73:in `block in
  from /usr/local/lib/ruby/1.9.1/webrick/utils.rb:70:in `each'
  from /usr/local/lib/ruby/1.9.1/webrick/utils.rb:70:in
  from /usr/local/lib/ruby/1.9.1/webrick/server.rb:74:in `listen'
  from /usr/local/lib/ruby/1.9.1/webrick/server.rb:62:in `initialize'
  from /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:24:in
`<top (required)>'
  from script/server:3:in `require'
  from script/server:3:in `<main>'

I think the problem is with bind, but I have no idea what to do with it.
Thanks in advance

It means exactly what it says: you have another process, probably
a previous instance of webrick, already running on the port that your
new instance is trying to bind to.

Find it and kill it.

`man netstat` might be of help if you have trouble figuring out which
process id is responsible.