How to fix NetAddress and NetConnectFailedReason could not be found erros in Tutorial?

Phando
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Working through the Fusion 100/102 tutorial
https://doc.photonengine.com/en-us/fusion/current/fusion-100/fusion-102
I have added the Fusion SDK to my project as well as added 'using Fusion' at the top of my BasicSpawner. Aside from that, I am unsure how to clear up the not found errors in the code examples.
SOLUTION:
using Fusion;
using Fusion.Sockets;
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