EF Core migration errors with the located assembly's manifest definition does not match the assembly reference


I'm trying to generate a database from the terminal of VS code using SQL Operations Studio, whenever I try to generate a migration this error occurs.

dotnet ef migrations add init

Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly '/usr/local/share/dotnet/sdk/2.1.401/DotnetTools/dotnet-ef/2.1.2/tools/netcoreapp2.1/any/tools/netcoreapp2.0/any/ef.dll'. The located assembly's manifestdefinition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

This is how my .csproj looks like now

<Project Sdk="Microsoft.NET.Sdk">

    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.1.2" />

Any workaround for this?

asked on Stack Overflow Aug 31, 2018 by Andres Correa • edited Aug 31, 2018 by marc_s

1 Answer


This can also happen if you have Microsoft.EntityFrameworkCore.Design package added to the wrong project.

I added the package to project A (netcore). Later I decided to make project A to target netstandard. I then created Project B (netcore) which reference project A (now netstandard).

When I try to create migration in project B the build succeeds but migration would fail because Microsoft.EntityFrameworkCore.Design was referenced in A instead of B. Moving the nuget reference to B fixes the problem.

answered on Stack Overflow Mar 11, 2020 by Tedy Pranolo

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