Ruby on Rails

Hello,
I need urgent help. When i run rails application with rails 3.0.3 and
ruby version 1.9.2p0. i get the below error. can anyone guide me what's
i missed?

rails s
/home/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/script_rails_loader.rb:11:
warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
/home/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems.rb:228:in
`activate': undefined method `map' for nil:NilClass (NoMethodError)

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