Freezing in rails 2.3.4, server startup fails about mail HOT 5 CLOSED

=> Booting Mongrel
=> Rails 2.3.4 application starting on http://0.0.0.0:3000
/usr/local/lib/site_ruby/1.8/rubygems.rb:270:in `activate': You have a nil object when you didn't expect it! (NoMethodError)
You might have expected an instance of Array.
The error occurred while evaluating nil.map
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:35:in `polyglot_original_require'
from /usr/lib/ruby/gems/1.8/gems/polyglot-0.2.9/lib/polyglot.rb:70:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/georg/salesking/code_new/trunk/vendor/gems/mail-1.3.0/lib/mail.rb:31
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from ./script/../config/../vendor/rails/railties/lib/rails/gem_dependency.rb:208:in `load'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:307:in `load_gems'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:307:in `each'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:307:in `load_gems'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:164:in `process'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
from /home/georg/salesking/code_new/trunk/config/environment.rb:19
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
from /home/georg/salesking/code_new/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/georg/salesking/code_new/trunk/vendor/rails/railties/lib/commands/server.rb:84
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from script/server:3