css - sass in rails 4 not reading -

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this simple. i'm not rails.

i set new project , controller called "say" , it's working fine. when write plain css in app/assets/stylesheets/say.scss reads fine.

however, when write sass, error message :

invalid css after "    font": expected selector or at-rule, ": $font-stack"

how compile sass - compass in rails 4 ?

thanks !


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