Error when adding a controller in Entity Framework

Question

I was following Entity framework tutorial in Microsoft.

https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application#main

Here I've done up to Set up EF to use a SQL Server Express LocalDB database .And in Creating a Student Controller and Views section when I tried to add a controller using MVC 5 Controller with Views, using Entity Framework (as mentioned in the tutorial), I'm getting an error saying

Attempting to install version '6.1.1' of 'EntityFramework' but the project already includes a different version. Skipping...

I tried reinstalling Entity Framework using the console, but still, it doesn't solve the problem. Does anyone know how to solve it?

Answer 1

Try to uninstall Entity Framework an then reinstall it

Uninstall-Package EntityFramework -Force

Install-Package EntityFramework

Answer 2

Run this command in Package manager console:

Uninstall-Package EntityFramework -Force

then close visual studio and delete entity framework floder in packages.config

again open Visual Studio and run this command:

Install-Package EntityFramework

Answer 3

Recently run into the same error.

Resolved it by uninstalling all the ef core packages through Nuget package manager and re-installing them with the latest stable version (5.0.9)

I have re-installed following ef core packages

• EntityFrameworkCore
• EntityFrameworkCore.SqlServer
• EntityFrameworkCore.Design
• EntityFrameworkCore.Tools

Note: Don't forget to rebuild the solution

See below screenshot