I created an empty 3D project in Unity 2022.3.28f1 and imported Coherence 1.2.0 via Package Manager, then got this error:
ArgumentNullException: RuntimeSettings is a PreloadedSingleton, which should be included in PlayerSettings' Preloaded Assets. Recompile for Preloaded Assets to be updated by coherence. If the issue persists, reimport all assets (Assets > Reimport All). If that doesn't solve the issue, check the docs (https://docs.coherence.io/overview/troubleshooting) or reach to us on community.
Screenshot: https://i.imgur.com/4XDXeLN.png
I added these scripts to Preloaded Assets and did Assets > Reimport All, but the error remained.
With Unity 2023.2.20f1 I got the same result.
This is my first installation of Coherence on this computer.
The first-step-tutorial-main project works fine.