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Java Introduction to Functional Programming Meet Streams Setting Up the Project

Class Not Found Exception?

I've imported the code straight from Github. It keeps giving this message when trying to run it:

Error: Could not find or load main class com.teamtreehouse.jobs.App Caused by: java.lang.ClassNotFoundException: com.teamtreehouse.jobs.App

I do see this code is 5+ years old. But what exactly could be going wrong?