UnityEngine.EventSystems not existing Unity 2020

After downloading the commit for the inventory systems course, I tried to open up the file and got multiple compile errors like:

The type or namespace name ‘EventSystems’ does not exist in the namespace ‘UnityEngine’ (are you missing an assembly reference?)

This is using Unity 2020.1.13f1. How do I fix these issues?

It definitely exists… first things first, have you tried restarting Unity?

The next thing to check is to make sure that you are using the classic input system and not the new input system.

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