Ruby on Rails

Hi
I m trying to do my first aplication in rails. I use oficial tutorial http://guides.rubyonrails.cz/#hello-world-v-rails and I have a problem with one of steps.
When I executed $ rake db:create (or only rake), I got an erorr:
Could not find coffee-script-source-1.3.3 in any of the sources
Run `bundle install` to install missing gems.

Before it I did step I did other steps.
thanks for help


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