/C#/Unity/Unity NetworkBehaviour the type or namespace could not be found

Unity NetworkBehaviour the type or namespace could not be found

For Unity 2020, I used Window > Package Manager and pressed the + (plus) sign:
Add Package from git URL and set it to:
	com.unity.multiplayer-hlapi
and
	com.unity.xr.legacyinputhelpers

Source: stackoverflow.com

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