Dev Academy - nRF Connect SDK Intermediate - Lesson 3 Exercise 1 - Devicetree Visual Editor problem

I am trying to work through the Dev Academy - nRF Connect SDK Intermediate - Lesson 3 Exercise 1. I have run into a problem in step 8. Everything prior has gone OK and I successfully built the application and have it selected in the Application window. However, when I open the Devicetree Visual Editor, no applications appear in the Build Contexts windows. Instead it states "This View shows the build contexts for the context files wiht the highest priority (open or select). In the Context Files windows there is nothing to select. I can't proceed past this step.

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