Chika Chang

I have some references on this topic: - [Unity - Manual: Roslyn analyzers and source generators](https://docs.unity3d.com/Manual/roslyn-analyzers.html) - [Cysharp/UnitGenerator](https://github.com/Cysharp/UnitGenerator)

These errors were appeared when this package add from [OpenUpm](https://openupm.com/packages/com.av.smart-hierarchy/). I checked lastest version on `master`, it only need [Fix license meta file](https://github.com/neon-age/Smart-Hierarchy/pull/32/commits/03e2534ce5be0c38da18b1fbf37862a32b098f34).