Puppet users - Aug 2014 - My Puppet Dashboard Can't Start After Machine Reboot

Hi guys, 

Please help! I have configured Puppet server and Dashboard. Everything 
works fine. However, after I reboot my Linux machine, my Dashboard can't be 
started.

Error:

Starting Puppet Dashboard: 
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`gem_original_require': no such file to load -- rack/handler/-e 
(MissingSourceFile)
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`require'
    from 
/usr/share/puppet-dashboard/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in
`require'
    from 
/usr/share/puppet-dashboard/vendor/rails/activesupport/lib/active_support/dependencies.rb:547:in
`new_constants_in'
    from 
/usr/share/puppet-dashboard/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in
`require'
    from /usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/handler.rb:76:in 
`try_require'
    from /usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/handler.rb:16:in 
`get'
    from 
/usr/share/puppet-dashboard/vendor/rails/railties/lib/commands/server.rb:45
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`gem_original_require'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`require'
    from /usr/share/puppet-dashboard/script/server:3

Any clue? Do I miss any component that should be started on boot?

Thanks a lot!!!!

Stella

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