I am using Rails 3.0.3, Ruby 1.9.2 with rvm on Ubunutu 10.04.  I
generated a new app by rails new testunicorn.  By default the Webrick
server runs ok.  In order to try Unicorn I uncommented gem 'unicorn'
in Gemfile and did bundle install.  rails server still runs webrick
and doing rails server unicorn leads to

col...@piglet:~/websites/testunicorn$ rails s unicorn
Exiting
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/handler.rb:21:in
`const_get': wrong constant name unicorn (NameError)
        from 
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/handler.rb:21:in
`get'
        from 
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/server.rb:217:in
`server'
        from 
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/server.rb:54:in
`start'
        from 
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands.rb:30:in
`block in <top (required)>'
        from 
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands.rb:27:in
`tap'
        from 
/home/colinl/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands.rb:27:in
`<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

Do I need to do something else to use unicorn?  Google has not
suggested anything.  There was one hit with the same problem in (I
think) Indonesian and google did not seem able to translate it.

Help would be much appreciated.

Colin

Gemfile.lock contains
GEM
  remote: http://rubygems.org/
  specs:
    abstract (1.0.0)
    actionmailer (3.0.3)
      actionpack (= 3.0.3)
      mail (~> 2.2.9)
    actionpack (3.0.3)
      activemodel (= 3.0.3)
      activesupport (= 3.0.3)
      builder (~> 2.1.2)
      erubis (~> 2.6.6)
      i18n (~> 0.4)
      rack (~> 1.2.1)
      rack-mount (~> 0.6.13)
      rack-test (~> 0.5.6)
      tzinfo (~> 0.3.23)
    activemodel (3.0.3)
      activesupport (= 3.0.3)
      builder (~> 2.1.2)
      i18n (~> 0.4)
    activerecord (3.0.3)
      activemodel (= 3.0.3)
      activesupport (= 3.0.3)
      arel (~> 2.0.2)
      tzinfo (~> 0.3.23)
    activeresource (3.0.3)
      activemodel (= 3.0.3)
      activesupport (= 3.0.3)
    activesupport (3.0.3)
    arel (2.0.6)
    builder (2.1.2)
    erubis (2.6.6)
      abstract (>= 1.0.0)
    i18n (0.5.0)
    kgio (2.0.0)
    mail (2.2.11)
      activesupport (>= 2.3.6)
      i18n (~> 0.5.0)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    mime-types (1.16)
    polyglot (0.3.1)
    rack (1.2.1)
    rack-mount (0.6.13)
      rack (>= 1.0.0)
    rack-test (0.5.6)
      rack (>= 1.0)
    rails (3.0.3)
      actionmailer (= 3.0.3)
      actionpack (= 3.0.3)
      activerecord (= 3.0.3)
      activeresource (= 3.0.3)
      activesupport (= 3.0.3)
      bundler (~> 1.0)
      railties (= 3.0.3)
    railties (3.0.3)
      actionpack (= 3.0.3)
      activesupport (= 3.0.3)
      rake (>= 0.8.7)
      thor (~> 0.14.4)
    rake (0.8.7)
    sqlite3-ruby (1.3.2)
    thor (0.14.6)
    treetop (1.4.9)
      polyglot (>= 0.3.1)
    tzinfo (0.3.23)
    unicorn (3.0.1)
      kgio (~> 2.0.0)
      rack

PLATFORMS
  ruby

DEPENDENCIES
  rails (= 3.0.3)
  sqlite3-ruby
  unicorn

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