Status: 500 Internal Server Error when starting ruby applica

I am trying to run an Ruby on Rails application developed internally.
Any input would be greatly appreciated…

When I start the server I get the following warning:

[shajizaidi@worf script]$ ./server
=> Booting WEBrick
=> Rails 2.3.2 application starting on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2009-05-28 18:29:41] INFO WEBrick 1.3.1
[2009-05-28 18:29:41] INFO ruby 1.8.7 (2008-08-11) [i686-linux]
[2009-05-28 18:29:46] WARN TCPServer Error: Address already in use -
bind(2)
[2009-05-28 18:29:46] INFO WEBrick::HTTPServer#start: pid=4587
port=3000

I have checked that there is no other application using port 3000

With lsof | grep 3000

I have tried to start the WEBrick on a different port and get the same
warning:

[shajizaidi@worf script]$ ./server -p 3001
=> Booting WEBrick
=> Rails 2.3.2 application starting on http://0.0.0.0:3001
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2009-05-28 19:12:34] INFO WEBrick 1.3.1
[2009-05-28 19:12:34] INFO ruby 1.8.7 (2008-08-11) [i686-linux]
[2009-05-28 19:12:39] WARN TCPServer Error: Address already in use -
bind(2)
[2009-05-28 19:12:39] INFO WEBrick::HTTPServer#start: pid=4805
port=3001

When I try to access the application through the firefox browser I get
the following error and trace:

SQL (0.2ms) SET NAMES ‘utf8’
SQL (0.1ms) SET SQL_AUTO_IS_NULL=0
/!\ FAILSAFE /!\ Thu May 28 19:15:14 -0700 2009
Status: 500 Internal Server Error
no such file to load – lib/zmags/zmags
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in
require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:521:in new_constants_in’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in
require' /home/shajizaidi/e-mangue/app/controllers/application_controller.rb:5 /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:380:in load_without_new_constant_marking’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:380:in
load_file' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:521:in new_constants_in’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:379:in
load_file' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:259:in require_or_load’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:425:in
load_missing_constant' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:80:in const_missing’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:92:in
const_missing' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/dispatcher.rb:90:in dispatch’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/dispatcher.rb:111:in
_call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/dispatcher.rb:82:in initialize’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/query_cache.rb:29:in
call' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/query_cache.rb:29:in call’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in
cache' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/query_cache.rb:9:in cache’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/query_cache.rb:28:in
call' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/head.rb:9:in
call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/methodoverride.rb:24:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/params_parser.rb:15:in
call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/rewindable_input.rb:25:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/session/cookie_store.rb:93:in
call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/reloader.rb:9:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/failsafe.rb:11:in
call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/lock.rb:11:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/lock.rb:11:in
synchronize' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/lock.rb:11:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/dispatcher.rb:106:in
call' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/rack/static.rb:31:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb:46:in
call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb:40:in each’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb:40:in
call' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/rack/log_tailer.rb:17:in call’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/content_length.rb:13:in
call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/webrick.rb:46:in service’
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:104:in service' /usr/local/lib/ruby/1.8/webrick/httpserver.rb:65:in run’
/usr/local/lib/ruby/1.8/webrick/server.rb:173:in start_thread' /usr/local/lib/ruby/1.8/webrick/server.rb:162:in start’
/usr/local/lib/ruby/1.8/webrick/server.rb:162:in start_thread' /usr/local/lib/ruby/1.8/webrick/server.rb:95:in start’
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in each' /usr/local/lib/ruby/1.8/webrick/server.rb:92:in start’
/usr/local/lib/ruby/1.8/webrick/server.rb:23:in start' /usr/local/lib/ruby/1.8/webrick/server.rb:82:in start’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/webrick.rb:13:in
run' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/commands/server.rb:111 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require’
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require’
./server:3