No EnableSwitch assembly reference

I am new to unity and C#. I am trying to create a simple VR world for a project i am working on for schools and I keep getting this error:
Assets/Oculus/VoiceMod/Scenes/Scripts/VoiceModDemo_Logic.cs(9,9): error CS0246: The type or namespace name `EnableSwitch' could not be found. Are you missing an assembly reference?