How I can fix this issue with a json gem on ruby? -

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i tried install json gem 

gem install json

and caused problem.

so decide uninstall ruby-on-rails , install again.

so want execute project in rails. however, i'm getting following error:

c:\users\franco\documents\github\risepay-ruby\risepay>rails s not find json-1.8.1 in of sources run `bundle install` install missing gems.

i tried install json again , use bundle install didn't work.

c:\users\franco\documents\github\risepay-ruby\risepay>bundle install dl deprecated, please use fiddle fetching gem metadata https://rubygems.org/........... resolving dependencies... using rake 10.3.2 using i18n 0.6.11  gem::installerror: 'json' native gem requires installed build tools.  please update path include build tools or download devkit 'http://rubyinstaller.org/downloads' , follow instructions @ 'http://github.com/oneclick/rubyinstaller/wiki/development-kit' error occurred while installing json (1.8.1), , bundler cannot continue. make sure `gem install json -v '1.8.1'` succeeds before bundling.


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