How to add WEB API controller via Entity Framework

Question

I tried to add a WEB API controller via EF like this:

And then I got this error in my Visual Studio 2013 Ultimate.

Does anyone know why?

UPDATE:

This is the mid picture:

Just for testing purposes...can you disable your antivirus and try again? — Hackerman
– Hackerman, Commented Nov 10, 2016 at 13:29

crucifery · Accepted Answer · 2017-03-16 14:59:45Z

1

Reinstall NuGet package as following:

Uninstall-Package EntityFramework

Install-Package EntityFramework

crucifery

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answered Nov 10, 2016 at 13:24

Ross Miller

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