title: after entering 'bundle install' on command line I get "make sure that 'gem install json -v 1.8.2' succeeds before bundling"
body: <p>I've been following this lynda tutorial online on 'Ruby on Rails.' I've downloaded Ruby, devkit and rails on to my computer. After I created sample_app and tried to run <strong>bundle install</strong>, but it keeps telling me <strong>make sure that 'gem install json -v 1.8.2' succeeds before bundling"</strong> I try to run <strong>gem install json -v 1.8.2</strong> and other variations including "gem install json -v 1.8.2 --verbose", "gem install json --platform=ruby" but everytime I get an error saying that it <strong>failed to build gem native extensions.</strong> The same thing happened when I was following the downloading devkit tutorial and I tried to install JSON as per its instructions. I've tried using <strong>gem update system 2.3.0</strong> but that doesn't work either. What could be wrong? </p>