ruby on rails - 'devise' is not recognised as internal or external command -

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can me error, cant use devise gem though installed, ive tried multiple versions still wont work? 

using devise 3.0.4 using hike 1.2.3 using multi_json 1.10.1 using jbuilder 2.2.5 using jquery-rails 3.1.2 using tilt 1.4.1 using sprockets 2.12.3 using sprockets-rails 2.2.1 using rails 4.1.8 using rdoc 4.1.2 using sass 3.2.19 using sass-rails 4.0.5 using sdoc 0.4.1 using sqlite3 1.3.10 using turbolinks 2.5.2 using tzinfo-data 1.2014.10 using uglifier 2.5.3 bundle updated!  c:\ruby\dev\devise-test>devise -h 'devise' not recognized internal or external command, operable program or batch file.  c:\ruby\dev\devise-test>rails -v dl deprecated, please use fiddle rails 4.1.8

not gems have associated executable. devise authentication solution works on top of rails/warden - should configuring within rails app (after adding gem gemfile).


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