bundler too old

App failed to start
An error happened during the initialization of your app.

This may be due to a typo, wrong number of arguments, or calling a function that doesn’t exists. Check the stack trace below for specific details.

Make sure the app is working locally in production mode, by running it with RAILS_ENV (for Rails apps) or RACK_ENV (for Sinatra or other rack apps) set to production. e.g. RAILS_ENV=production script/server.

Original Error
/disk1/home/slugs/188222_3bfbd77_caea/mnt/config/../config/preinitializer.rb:9: Your bundler version is too old.Run `gem install bundler` to upgrade. (RuntimeError)
	from /disk1/home/slugs/188222_3bfbd77_caea/mnt/config/boot.rb:28:in `load'
	from /disk1/home/slugs/188222_3bfbd77_caea/mnt/config/boot.rb:28:in `preinitialize'
	from /disk1/home/slugs/188222_3bfbd77_caea/mnt/config/boot.rb:10:in `boot!'
	from /disk1/home/slugs/188222_3bfbd77_caea/mnt/config/boot.rb:124
	from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from /disk1/home/slugs/188222_3bfbd77_caea/mnt/config/application.rb:2
	from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from /disk1/home/slugs/188222_3bfbd77_caea/mnt/config/environment.rb:2
	from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/thin-1.2.6/lib/rack/adapter/rails.rb:42:in `load_application'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/thin-1.2.6/lib/rack/adapter/rails.rb:23:in `initialize'
	from /home/heroku_rack/heroku.ru:27:in `new'
	from /home/heroku_rack/heroku.ru:27
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:29:in `instance_eval'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:29:in `initialize'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:46:in `new'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:46:in `map'
	from /home/heroku_rack/heroku.ru:16
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:29:in `instance_eval'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:29:in `initialize'
	from /home/heroku_rack/heroku.ru:9:in `new'
	from /home/heroku_rack/heroku.ru:9
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:29:in `instance_eval'
	from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb:29:in `initialize'
	from /home/heroku_rack/heroku.ru:1:in `new'
	from /home/heroku_rack/heroku.ru:1