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Rails 4.0 でSporkを動かすと uninitialized constant ActiveModel::Observing (NameError) と出る

参考
Rails4でsporkがエラー - rochefort's blog

上記ブログに書いてあるとおり、

gem search spork --pre

でspork 1.0.0rc3を探してきて、

gem 'spork', '1.0.0rc3'

と記入後、

bundle update spork

とかやると動くようになりました。

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Help us understand the problem. What are the problem?