passenger is not running with rails ubuntu 12.04, is any budy can tell what is this error

/home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/passenger-3.0.0/lib/ phusion_passenger/standalone/runtime_installer.rb:225:in `*': negative argument (ArgumentError)   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 225:in `show_progress'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 148:in `block in install!'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 424:in `block (2 levels) in install_passenger_support_files'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 329:in `block in run_rake_task!'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 324:in `popen'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 324:in `run_rake_task!'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 423:in `block in install_passenger_support_files'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 422:in `chdir'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 422:in `install_passenger_support_files'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/runtime_installer.rb: 144:in `install!'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/abstract_installer.rb:63:in `start'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/start_command.rb: 294:in `install_runtime'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/start_command.rb: 315:in `ensure_nginx_installed'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/start_command.rb: 59:in `run'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:93:in `block in run_command'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:48:in `block in each_command'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:43:in `each'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:43:in `each_command'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:91:in `run_command'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:62:in `run!'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/lib/phusion_passenger/standalone/main.rb:39:in `run!'   from /home/ubuntu/.rvm/gems/ruby-1.9.3-p286@new_r/gems/ passenger-3.0.0/bin/passenger:32:in `<top (required)>'   from /usr/local/bin/passenger:23:in `load'   from /usr/local/bin/passenger:23:in `<main>'