Could not load file or assembly 'Microsoft.EntityFrameworkCore.SqlServer, Version=1.1.0.0' after upgrading to 1.1.0

Question

I have a Asp.Net Core project targeting .NET 462 and it was working with Asp.Net Core version 1.0.1. After upgrading to "1.1.0" I got this error:

FileLoadException: Could not load file or assembly 'Microsoft.EntityFrameworkCore.SqlServer, Version=1.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

project.json

"dependencies": {
    "AspNet.Mvc.TypedRouting": "1.2.0",
    "AutoMapper": "5.1.1",
    "AutoMapper.Extensions.Microsoft.DependencyInjection": "1.1.2",
    "BundlerMinifier.Core": "2.2.306",
    "JetBrains.Annotations": "10.2.1",
    "libphonenumber-csharp": "7.7.4",
    "Microsoft.AspNetCore.Authentication.Cookies": "1.1.0",
    "Microsoft.AspNetCore.Authentication.Facebook": "1.1.0",
    "Microsoft.AspNetCore.Authentication.Google": "1.1.0",
    "Microsoft.AspNetCore.Authentication.MicrosoftAccount": "1.1.0",
    "Microsoft.AspNetCore.Authentication.OpenIdConnect": "1.1.0",
    "Microsoft.AspNetCore.Authentication.Twitter": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Mvc": "1.1.0",
    "Microsoft.AspNetCore.Razor.Tools": "1.1.0-preview4-final",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel.Https": "1.1.0",
    "Microsoft.AspNetCore.Session": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.EntityFrameworkCore": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
    "Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final",
    "Microsoft.Extensions.Configuration": "1.1.0",
    "Microsoft.Extensions.Configuration.Abstractions": "1.1.0",
    "Microsoft.Extensions.Configuration.CommandLine": "1.1.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.1.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.0",
    "Microsoft.VisualStudio.Web.CodeGenerators.Mvc": "1.1.0-preview4-final",
    "MotleyFlash": "0.3.0",
    "MotleyFlash.AspNetCore.MessageProviders": "0.2.0",
    "MotleyFlash.AspNetCore.ViewHelpers": "0.2.0",
    "SendGrid.NetCore": "1.0.0-rtm-00002",
    "System.Interactive.Async": "3.1.0",
    "Twilio": "4.7.2"
},
"frameworks": {
    "net462": {
        "dependencies": {
            "TaxiGun.Server.IdentityServer.Data": {
                "target": "project"
            },
            "TaxiGun.Server.Services": {
                "target": "project"
            }
        }
    }
},

When I take a look at on build output folder, I can see all the libraries in a proper version except "Microsoft.EntityFrameworkCore.SqlServer":

I think it is causing the problem. But I just can not figure out why the version is wrong? Is it because the nuget package has a wrong version inside?

Solution

Complete project references clean-up solved my problem.

1. Delete all bin/obj folders
2. Delete all project.lock.json files
3. Delete local Nuget repository cache (computer one)
4. Remove all references from project.json file and add only required ones (with the help of R#)
5. nuget udpate, dotnet restore = project is running

When I'm thinking about it again, maybe only point 4 was important?

Comments

[Ahmad]

1st point: deleting bin & obj folder then compile again worked for me

[Bennybear]

Regarding #4, in VS 2017, you can go into your project's .csproj file (project.json was for VS 2015).

[Jeremy Thompson]

After multiple tries I eventually did all the steps, in all orders. I eventually had luck specifically adding Microsoft.EntityFrameworkCore.SqlServer and Microsoft.AspNetCore. XYZ specific libraries the project was complaining about missing. Definitely a versioning or API dependency tree issue.

[taher]

Deleting "bin" and "obj" folders and building the project solved my problem. thank u