Hi Tony,
Because of some problems, I deleted my library folder (of unity) and after that I went into some problems with Dialogue Manager. After enabling Cinemachine support, I got this error:
Assets\Plugins\Pixel Crushers\Dialogue System\Wrappers\Options\Cinemachine\CinemachineCameraPriorityOnDialogueEvent.cs(16,90): error CS0234: The type or namespace name 'CinemachineCameraPriorityOnDialogueEvent' does not exist in the namespace 'PixelCrushers.DialogueSystem' (are you missing an assembly reference?)
Make sure your Project Settings' Scripting Define Symbols includes USE_CINEMACHINE.
You may need to right-click on CinemachineCameraPriorityOnDialogueEvent.cs in this folder:
Plugins / Pixel Crushers / Dialogue System / Scripts / Options / Cinemachine / Triggers
and then select Reimport. Then do the same in the Wrappers folder.