Rails - Jul 2014 - File to import not found or unreadable: bootstrap. Michaeal harts tutorial

Hello, 

Im following Micheal harts tutorial. 
On chapter 5 you have to change the custum.css.scss file.

But when I do rails s I see the above error. 

You can find all the sources here :  
https://github.com/roelof1967/sample_app

Roelof

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