Getting "Program does not contain a static main..." error with Origami tutorial project

So I am using the Origami hololens example project from:
https://developer.microsoft.com/en-us/windows/mixed-reality/holograms_101

I can build it from Unity 2017.1.f1 (newest I believe) but when I try to run Origami.sln I get "Program does not contain a static 'Main' method suitable for an entry point".

Any ideas? Please ask me questions about what I did, but I believe I followed the tutorial correctly.