A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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Unity.Netcode.Components is a separate assembly (dll). You probably need to add an assembly reference in your assembly definition. If you haven't...
This issue (a null reference in the ILPP code when creating a generic inheriting from NetworkBehavior) is fixed in 1.0.0-pre.10 which is available...