Azure DevOps VSTS .netcore build failing, but works fine on my PC

Question

I keep getting dependencies errors in my .net core2.1.1 MVC website. It builds fine from my PC. but Azure DevOps is not compiling refrences properly.

Adding a couple of pics to help sort this out.

DevOps Error. After I added a update nuget to the latest

The nuget command failed with exit code(1) and error(NU1607: Version conflict detected for Microsoft.Extensions.DependencyInjection.Abstractions. Reference the package directly from the project to resolve this issue. CBW.Website (>= 1.0.0) -> Microsoft.VisualStudio.Web.CodeGeneration.Design (>= 2.1.5) -> Microsoft.VisualStudio.Web.CodeGenerators.Mvc (>= 2.1.5) -> Microsoft.VisualStudio.Web.CodeGeneration (>= 2.1.5) -> Microsoft.Extensions.DependencyInjection (>= 2.1.1) -> Microsoft.Extensions.DependencyInjection.Abstractions (>= 2.1.1) CBW.Website (>= 1.0.0) -> Microsoft.AspNetCore.App (>= 2.1.0) -> Microsoft.Extensions.DependencyInjection.Abstractions (>= 2.1.0). Errors in D:\a\1\s\CBW.Website\CBW.Website.csproj NU1607: Version conflict detected for Microsoft.Extensions.DependencyInjection.Abstractions. Reference the package directly from the project to resolve this issue. CBW.Website (>= 1.0.0) -> Microsoft.VisualStudio.Web.CodeGeneration.Design (>= 2.1.5) -> Microsoft.VisualStudio.Web.CodeGenerators.Mvc (>= 2.1.5) -> Microsoft.VisualStudio.Web.CodeGeneration (>= 2.1.5) -> Microsoft.Extensions.DependencyInjection (>= 2.1.1) -> Microsoft.Extensions.DependencyInjection.Abstractions (>= 2.1.1) CBW.Website (>= 1.0.0) -> Microsoft.AspNetCore.App (>= 2.1.0) -> Microsoft.Extensions.DependencyInjection.Abstractions (>= 2.1.0).)

Packages failed to restore

***************Edit I passed the nuget errors based on and targeting the everything to version 2.1.5 in my csproj. Now I am back to the restore error.

My Csproj

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

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
     <RuntimeFrameworkVersion>2.1.5</RuntimeFrameworkVersion>
    <UserSecretsId>aspnet-AspNetCorePagesIdentity-***************-***-*******-</UserSecretsId>
    <TypeScriptToolsVersion>3.0</TypeScriptToolsVersion>
    <AutoGenerateBindingRedirects>True</AutoGenerateBindingRedirects>
  </PropertyGroup>

  <ItemGroup>
    <Content Include="Client\assets\controlbyweb-logo.png" />
    <Content Include="Client\assets\webrelay_170.png" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.5" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.5" PrivateAssets="All" />
  </ItemGroup>

  <ItemGroup>
    <Folder Include="Areas\Identity\Services\" />
  </ItemGroup>

  <ItemGroup>
    <Content Update="Client\_ViewImports.cshtml">
      <Pack>$(IncludeRazorContentInPack)</Pack>
    </Content>
  </ItemGroup>


</Project>

**** error**

2018-10-08T14:44:09.2159846Z   Restoring packages for D:\a\1\s\CBW.Website\CBW.Website.csproj...
2018-10-08T14:44:09.7085782Z C:\hostedtoolcache\windows\dncs\1.0.4\x64\sdk\1.0.4\NuGet.targets(97,5): error : Package Microsoft.VisualStudio.Web.CodeGeneration.Design 2.1.5 is not compatible with netcoreapp2.1 (.NETCoreApp,Version=v2.1). Package Microsoft.VisualStudio.Web.CodeGeneration.Design 2.1.5 supports: [D:\a\1\s\CBW.Website\CBW.Website.csproj]
2018-10-08T14:44:09.7094563Z C:\hostedtoolcache\windows\dncs\1.0.4\x64\sdk\1.0.4\NuGet.targets(97,5): error :   - net461 (.NETFramework,Version=v4.6.1) [D:\a\1\s\CBW.Website\CBW.Website.csproj]
2018-10-08T14:44:09.7099570Z C:\hostedtoolcache\windows\dncs\1.0.4\x64\sdk\1.0.4\NuGet.targets(97,5): error :   - netstandard2.0 (.NETStandard,Version=v2.0) [D:\a\1\s\CBW.Website\CBW.Website.csproj]
2018-10-08T14:44:09.7102618Z C:\hostedtoolcache\windows\dncs\1.0.4\x64\sdk\1.0.4\NuGet.targets(97,5): error : Package Microsoft.AspNet.WebApi.Client 5.2.6 is not compatible with netcoreapp2.1 (.NETCoreApp,Version=v2.1). Package Microsoft.AspNet.WebApi.Client 5.2.6 supports: [D:\a\1\s\CBW.Website\CBW.Website.csproj]
2018-10-08T14:44:09.7103331Z C:\hostedtoolcache\windows\dncs\1.0.4\x64\sdk\1.0.4\NuGet.targets(97,5): error :   - net45 (.NETFramework,Version=v4.5) [D:\a\1\s\CBW.Website\CBW.Website.csproj]
2018-10-08T14:44:09.7103534Z C:\hostedtoolcache\windows\dncs\1.0.4\x64\sdk\1.0.4\NuGet.targets(97,5): error :   - netstandard2.0 (.NETStandard,Version=v2.0) [D:\a\1\s\CBW.Website\CBW.Website.csproj]
2018-10-08T14:44:09.7103694Z        Package Microsoft.Extensions.WebEncoders 2.1.1 is not compatible with netcoreapp2.1 (.NETCoreApp,Version=v2.1). Package Microsoft.Extensions.WebEncoders 2.1.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
2018-10-08T14:44:10.0475303Z       Package Microsoft.Net.Http.Headers 2.1.1 is not compatible with netcoreapp2.1 (.NETCoreApp,Version=v2.1). Package Microsoft.Net.Http.Headers 2.1.1 supports: netstandard2.0 (.NETStandard,Version=v2.0)
2018-10-08T14:44:10.0475426Z       Package Microsoft.VisualStudio.Web.CodeGenerators.Mvc 2.1.5 is not compatible with netcoreapp2.1 (.NETCoreApp,Version=v2.1). Package Microsoft.VisualStudio.Web.CodeGenerators.Mvc 2.1.5 supports: netstandard2.0 (.NETStandard,Version=v2.0)
2018-10-08T14:44:10.0475562Z       One or more packages are incompatible with .NETCoreApp,Version=v2.1.
2018-10-08T14:44:10.0475666Z   
2018-10-08T14:44:10.0475771Z   NuGet Config files used:
2018-10-08T14:44:10.0475909Z       D:\a\1\Nuget\tempNuGet_13.config
2018-10-08T14:44:10.0476013Z   
2018-10-08T14:44:10.0476113Z   Feeds used:
2018-10-08T14:44:10.0476241Z       https://api.nuget.org/v3/index.json
2018-10-08T14:44:10.1010270Z ##[error]Error: C:\hostedtoolcache\windows\dncs\1.0.4\x64\dotnet.exe failed with return code: 1
2018-10-08T14:44:10.1032411Z ##[error]Packages failed to restore
2018-10-08T14:44:10.1055895Z ##[section]Finishing: Restore

Answer 1

Solved it Edit 7/5/19 The YML file or the editor has the same issue with the .netcore SDK version. I have updated mine multiple times now. It will break randomly when the core SDK team pushes updates to Nuget, or you update VS or sometimes.. My builds are automated and it works today and tomorrow it does not, after 0 code changes. But I always come back to this fix and then it builds again.

Get your SDK version in VS2017

Set your version in DevOps

Answer 2

I would suggest checking the following 2 items:

1. Build in RELEASE locally and see if the problem is reproduced.

2. Be specific about NuGet version in VSTS: