server problem or rails problem?

Hello, im trying to upload my rails app to an shared hosting environment. The application works fine on my development machine ( as it usually does ). but after uploading it running bundle install and then mogrel I still get a dependency error:

activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require': no such file to load -- dispatcher (LoadError)   from /home/gregory/ruby/gems/gems/activesupport-3.0.0/lib/ active_support/dependencies.rb:239:in `require'   from /home/gregory/ruby/gems/gems/activesupport-3.0.0/lib/ active_support/dependencies.rb:227:in `load_dependency'   from /home/gregory/ruby/gems/gems/activesupport-3.0.0/lib/ active_support/dependencies.rb:239:in `require'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ rails.rb:148:in `rails'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails: 113:in `cloaker_'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ configurator.rb:149:in `call'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ configurator.rb:149:in `listener'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails: 99:in `cloaker_'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ configurator.rb:50:in `call'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ configurator.rb:50:in `initialize'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails: 84:in `new'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails: 84:in `run'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ command.rb:212:in `run'   from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281   from /usr/bin/mongrel_rails:19:in `load'   from /usr/bin/mongrel_rails:19

is this a problem with the server or is something wrong with the application?

( searching on Google found nothing )

thanks for any help, Adam