Modern Front-End Development for Rails: B7 running the example app fails( page xv)

There is definitely some code in there that needs a logged in user and should be cleaned up for the next beta. This should be fixed if you log in (going directly to http://localhost:3000/users/sign_in if you need to, the seeded users are in the seeds.rb file, I think you can use areader@example.com with awesome.