Enumerable.cs not found

Hello! After initializing a "ContentPage", the following error appears: "Enumerable.cs not found".

In fact, I did not find the class. Is "Enumerable.cs" unique to "System.Core"? I tried installing "System.Core" but it showed an incompatibility I do not understand.

How can I adjust this error or be able to install "Enumerable.cs"?

Visual Studio 2015
Xamarin.Forms

Regards,
Domingos Neto

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