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Rails 3, MongoId & bson version problem

I just updated to Rails 3 final. Now I'm having problems with MongoId, Mongo's Ruby driver & bson. When I try to run Rails, I get "You have already activated bson 1.0.7, but your Gemfile requires bson 1.0.4. Consider using bundle exec. (Gem::LoadError)".

MongoId requires bson_ext 1.0.4 so I have gem "bson_ext", "1.0.4" in my Gemfile. I tried to uninstall bson 1.0.7 but then Rails failed to start because Mongo Ruby driver requires bson >= 1.0.5.

So any ideas how I can get this solved?

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