ruby on rails - Getting Susy to compile with Koala on windows -

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just started using sass first time. set ruby on rails on windows 8, , got work , compile koala compiler allright. need use susy library, not working. far, i've installed following:

1. ruby, using ruby installer  2. gems: a. gem install rails b. gem install sass c. gem install susy

this doesn't seem susy working. sass compiler keeps throwing errors whenever encounters susy syntax. on page mention make sure sass-rails version 5.0.0.beta1, ruby command prompt doesn't accept command such gem 'sass-rails', '~> 5.0.0.beta1'. have enter somewhere else? or need use different compiler?

be gentle i'm new :d


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