Errors in Unity SDK

Using Unity 2019.4.3111 as specified in the docs. I download the VR Chat 3 SDK and then upload it to my Unity project. The errors I get are:

Assets/VRCSDK/SDK3/Runtime/UnityEventFilter.cs(1018,24): error CS0246: The type or namespace name ‘Cinemachine’ could not be found (are you missing a using directive or an assembly reference?)

Assets/VRCSDK/SDK3/Runtime/UnityEventFilter.cs(1021,32): error CS0103: The name ‘Cinemachine’ does not exist in the current context

Packages/com.vrchat.vrcsdk3/Editor/UPMImporter/UPMImporter.cs(50,18): warning CS0219: The variable ‘importedNewPackage’ is assigned but its value is never used

Any idea what I have to do to resolve this?