There was an error running the selected code generator: Could not load file or assembly Microsoft.EntityFrameworkCore, version = 2.0.1.0

Question

When I was creating a Controller and a View by MVC Controller with views, using Entity Framework I got an error.

The Error is:

There was an error running the selected code generator: 'Could not load file or assembly Microsoft.EntityFrameworkCore, version = 2.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' the located assembly's manifest definition does not match the assembly reference

Creating MVC Controller with views, using Entity Framework:

How can I solve this problem?

I use Visual Studio Version 15.5.2 and version of Microsoft.AspNetCore.All is 2.0.0

Solution 1

I updated the Microsoft.AspNetCore.All to version 2.0.3 and now it does work right.

Solution 2

Go to NugetPackage Manager and update the Microsoft.AspNetCore.All package

Solution 3

For me none of the above solutions worked. I had to add Microsoft.EntityFrameworkCore and Microsoft.EntityFrameworkCore.Design packages even though I have Microsoft.AspNetCore.All package added to my project.

Edit project in VS 2017 and add these lines

<PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.3" /> 
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.3" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.3" />

Solution 4

Update your packages or it can happen when you have an older SDK. Download a new .NET Core SDK and runtime from www.microsoft.com/net

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Comments

[George Wurthmann]

Works, but I needed to close my solution, reopen and build before Scaffolding again.

[Trinidad]

Same solution works also in 2019 when adding a scaffolded item and dotnet-aspnet-codegenerator-design.dll throws "The located assembly's manifest definition does not match the assembly reference". Just add those packages in their relevant version to your solution.