ERROR: Detected package downgrade: Microsoft.AspNetCore.SpaServices.Extensions from 2.1.1 to 2.1.0.

Steps to reproduce

• Install latest .net core SDK
• Have a previous .net core app

csproj

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

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <TypeScriptCompileBlocked>true</TypeScriptCompileBlocked>
    <TypeScriptToolsVersion>Latest</TypeScriptToolsVersion>
    <IsPackable>false</IsPackable>
    <SpaRoot>ClientApp\</SpaRoot>
    <DefaultItemExcludes>$(DefaultItemExcludes);$(SpaRoot)node_modules\**</DefaultItemExcludes>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="2.1.0" />
  </ItemGroup>

  <ItemGroup>
    <!-- Don't publish the SPA source files, but do show them in the project files list -->
    <Content Remove="$(SpaRoot)**" />
    <None Include="$(SpaRoot)**" Exclude="$(SpaRoot)node_modules\**" />
  </ItemGroup>

  <Target Name="DebugEnsureNodeEnv" BeforeTargets="Build" Condition=" '$(Configuration)' == 'Debug' And !Exists('$(SpaRoot)node_modules') ">
    <!-- Ensure Node.js is installed -->
    <Exec Command="node --version" ContinueOnError="true">
      <Output TaskParameter="ExitCode" PropertyName="ErrorCode" />
    </Exec>
    <Error Condition="'$(ErrorCode)' != '0'" Text="Node.js is required to build and run this project. To continue, please install Node.js from https://nodejs.org/, and then restart your command prompt or IDE." />
    <Message Importance="high" Text="Restoring dependencies using 'npm'. This may take several minutes..." />
    <Exec WorkingDirectory="$(SpaRoot)" Command="npm install" />
  </Target>

  <Target Name="PublishRunWebpack" AfterTargets="ComputeFilesToPublish">
    <!-- As part of publishing, ensure the JS resources are freshly built in production mode -->
    <Exec WorkingDirectory="$(SpaRoot)" Command="npm install" />
    <Exec WorkingDirectory="$(SpaRoot)" Command="npm run build" />

    <!-- Include the newly-built files in the publish output -->
    <ItemGroup>
      <DistFiles Include="$(SpaRoot)build\**; $(SpaRoot)build-ssr\**" />
      <ResolvedFileToPublish Include="@(DistFiles->'%(FullPath)')" Exclude="@(ResolvedFileToPublish)">
        <RelativePath>%(DistFiles.Identity)</RelativePath>
        <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
      </ResolvedFileToPublish>
    </ItemGroup>
  </Target>

</Project>

Expected behavior

It should build and work

Actual behavior

Errors:

error NU1605: Detected package downgrade: Microsoft.AspNetCore.SpaServices.Extensions from 2.1.1 to 2.1.0. Reference the package directly from the project to select a different version. error NU1605: LogicTrade.Connect.UI.React -> Microsoft.AspNetCore.App 2.1.1 -> Microsoft.AspNetCore.SpaServices.Extensions (>= 2.1.1 && < 2.2.0) error NU1605: LogicTrade.Connect.UI.React -> Microsoft.AspNetCore.SpaServices.Extensions (>= 2.1.0)

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
Version:   2.1.301
Commit:    59524873d6

Runtime Environment:
OS Name:     Windows
OS Version:  6.1.7601
OS Platform: Windows
RID:         win7-x64
Base Path:   C:\Program Files\dotnet\sdk\2.1.301\

Host (useful for support):
 Version: 2.1.1
 Commit:  6985b9f684

.NET Core SDKs installed:
 2.0.2 [C:\Program Files\dotnet\sdk]
 2.1.2 [C:\Program Files\dotnet\sdk]
 2.1.4 [C:\Program Files\dotnet\sdk]
 2.1.100 [C:\Program Files\dotnet\sdk]
 2.1.101 [C:\Program Files\dotnet\sdk]
 2.1.102 [C:\Program Files\dotnet\sdk]
 2.1.103 [C:\Program Files\dotnet\sdk]
 2.1.104 [C:\Program Files\dotnet\sdk]
 2.1.200 [C:\Program Files\dotnet\sdk]
 2.1.201 [C:\Program Files\dotnet\sdk]
 2.1.300-preview1-008174 [C:\Program Files\dotnet\sdk]
 2.1.300-rc1-008673 [C:\Program Files\dotnet\sdk]
 2.1.300 [C:\Program Files\dotnet\sdk]
 2.1.301 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
 Microsoft.AspNetCore.All 2.1.0-preview1-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
 Microsoft.AspNetCore.All 2.1.0-rc1-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
 Microsoft.AspNetCore.All 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
 Microsoft.AspNetCore.All 2.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
 Microsoft.AspNetCore.App 2.1.0-preview1-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.AspNetCore.App 2.1.0-rc1-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.AspNetCore.App 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.AspNetCore.App 2.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.NETCore.App 2.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.0.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.1.0-preview1-26216-03 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.1.0-rc1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 2.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
 https://aka.ms/dotnet-download

[gerjandev]

Im not trying to be impolite, but last days/weeks I have a lot of such issues on .NET Core. What is going on?

More important: how can I fix this?

[natemcmaster]

If you are on .NET Core 2.1, remove the PackageReference to Microsoft.AspNetCore.SpaServices.Extensions. This is part of the Microsoft.AspNetCore.App metapackage.