I have the same issue - I can run the pre-compiled demo in SRWorks_v0.9.7.1_Unity_Prebuild_Samples, but not when I open the Samples in Unity (I see a black screen and white square).
I'm using Vive Pro Eye, SRWorks 0.9.7.1, Unity 2019.4.16, SteamVR 1.15.2, and SRWorks Runtime 0.9.7.1
Edit: I got the demo to run by adding TrackedObject and PoseAction to LeftHand and Right (which were previously set to None). The code runs, but the controller buttons don't do anything. I don't know what they should be set to -- I don't understand why the actions are not already set in the demo code.