Why unity doesn't find EventSystems and UI?

After the installation of UnityEngine.Monetization was automatically changed project. The solution open in VS 2017 Community. Now the decision is not one project but 3: MyProject, MyProject.Editor, MyProject.Plugins. Now unity complains for the line using UnityEngine.EventSystems; (the type or namespace name "EventSystems" does not exist in the namespace "UnityEngine"). Besides that there was error in the line "GetComponent()"(could not find Image) and a lot of the same mistakes. What is the problem here?
April 4th 20 at 00:33
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