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c#asp.net-mvcasp.net-coreasp.net-core-2.1

System.IO.FileLoadException: Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Core, Version=2.1.3.0'

I'm receiving the following warning on my ASP.NET Core 2.1 MVC project.

C:\Program Files\dotnet\sdk\2.2.102\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.DefaultItems.targets(153,5): warning NETSDK1071: A PackageReference to 'Microsoft.AspNetCore.App' specified a Version of 2.1.7. Specifying the version of this package is not recommended. For more information, see https://aka.ms/sdkimplicitrefs

It appears to be referencing this line in my .csproj file:

<PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.7" />

If I remove the version from the PackageReference the warning goes away, but then I get this error when I try to start my project:

System.IO.FileLoadException: Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Core, Version=2.1.3.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

File name: 'Microsoft.AspNetCore.Mvc.Core, Version=2.1.3.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'

at MyProject.Web.Startup.ConfigureServices(IServiceCollection services)

--- End of stack trace from previous location where exception was thrown ---

at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)

at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()

at Microsoft.AspNetCore.Hosting.Internal.WebHost.Initialize()

--- End of stack trace from previous location where exception was thrown ---

at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

I'm not sure where Microsoft.AspNetCore.Mvc.Core, Version=2.1.3.0 is even coming from. Anyone else run into the same problem?

Solution

  • I'm still not sure what caused the problem, but to fix it I went ahead and updated from ASP.NET Core 2.1 to 2.2 by following this article.

    Here's the relevant part of my .csproj after the update:

    <PropertyGroup>
    <TargetFramework>netcoreapp2.2</TargetFramework>
    <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>

<ItemGroup>
    <!-- Other Unrelated Packages Here -->

    <PackageReference Include="Microsoft.AspNetCore.App" />

    <!-- Other Unrelated  Packages Here -->
</ItemGroup>

    Then, I updated all of my NuGet packages to the latest version.

    I imagine there's a solution without having to upgrade versions of ASP.NET Core, but since I don't have any reason not to upgrade, this is what I did to fix it.