Fixing the error: "The element 'entityFramework' has invalid child element 'providers'. List of possible elements expected: 'contexts'"

If you're getting the error message:

The element 'entityFramework' has invalid child element 'providers'. List of possible elements expected: 'contexts'.

and you're using Visual Studio 2012 or Visual Studio 2013, then you can download and install Entity Framework 6 Tools for Visual Studio 2012 & 2013.

These tools update the schema used to validate the configuration files for your projects.

Entity Framework 6 Tools for Visual Studio 2012 & 2013
https://www.microsoft.com/en-us/download/details.aspx?id=40762

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