Rails 3.0 apps (after rails 3.1 install) now give error with rake

getting a message You have already activated rake 0.9.2, but your Gemfile requires rake 0.8开发者_JAVA百科.7. Consider using bundle exec.

saw references to "update the standard Ruby installation from Rake 0.8.7 to Rake 0.9.2"

how do I do this update?

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Try doing a bundle update rake

This will update rake and resolve the dependencies.

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You want to your commands with "bundle exec " without the double quotes