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How Do You Debug an “Application Error” That Is Live on Heroku?

One common way to debug your code live on Heroku is to use

Heroku Logs --tail

…which gives you live access to all the activity occurring on your site.

In this video I look at how to use the logs; and I also explains the difference between Gemfile and Gemfile.lock.

Ultimately we solve an ugly “mingw32” error where the student (Hey Nick!) has major differences in his Gemfile and Gemfile.lock.