Bundler Error Backtrace

/usr/local/lib/site_ruby/1.8/rubygems/dependency.rb:52:in `initialize'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:355:in `new'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:355:in `search'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:181:in `resolve'
/usr/local/lib/site_ruby/1.8/rubygems/source_index.rb:95:in `sort_by'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:177:in `each'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:177:in `sort_by'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:177:in `resolve'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:162:in `start'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:131:in `resolve'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:130:in `catch'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/resolver.rb:130:in `resolve'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/definition.rb:153:in `resolve'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/definition.rb:93:in `specs'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/definition.rb:137:in `specs_for'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/definition.rb:126:in `requested_specs'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/environment.rb:23:in `requested_specs'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/runtime.rb:11:in `setup'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler.rb:100:in `setup'
/home/[username]/.gem/ruby/1.8/gems/bundler-1.0.0/lib/bundler/setup.rb:6
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/[application_path]/config/boot.rb:7
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
/home/[application_path]/config/application.rb:1
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
/home/[application_path]/config/environment.rb:2
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
config.ru:3
/home/[username]/.gem/ruby/1.8/gems/rack-1.2.1/lib/rack/builder.rb:46:in `instance_eval'
/home/[username]/.gem/ruby/1.8/gems/rack-1.2.1/lib/rack/builder.rb:46:in `initialize'
config.ru:1:in `new'
config.ru:1