application_controller.rb has no solution code

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A couple of issues with this lab:

1. Although this lab is a code along, there was an issue with the solution code for application_controller.rb missing.

2. At the step where you insert 'puts params' in the post '/registrations' route, the code breaks and Sinatra throws an error, and trying to find the issue was only solved by copying over all the correct code for the login page, as well as the routes:

undefined method `name' for nil:NilClass
file: home.erb location: block in singleton class line: 1```