Passenger throwing undefined method `-@' for "master":String after Puppet 3.0.0 upgrade

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http://serverfault.com – My Puppet master is using Passenger to serve. After upgrading to Puppet 3.0.0 I am getting the following error: [ pid=17576 thr=70231398486460 file=utils.rb:176 time=2012-10-01 17:37:12.892 ]: *** Exception NoMethodError in PhusionPassenger::Rack::ApplicationSpawner (undefined method `-@' for "master":String) (process 17576, thread #): from config.ru:7 from /usr/lib/ruby/gems/1.8/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval' from /usr/lib/ruby/gems/1.8/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize' from config.ru:1:in `new' from con (HowTos)