【rake错误】Gem::LoadError: You have already activated rake 12.3.1, but your Gemfile requires rake 11.1.2. Prepending `bundle exec` to your command may solve this.

Gem::LoadError: You have already activated rake 12.3.1, but your Gemfile requires rake 11.1.2. Prepending bundle exec to your command may solve this.

如何解决？

重装rake

gem install rake