Team Services: Nuget Packager task failing

Question

I have a Build definition in Team Services that includes a Nuget Packager task. I'm using Hosted build agents.
In the last couple of builds this task began to fail, with the following message:

2017-02-22T21:43:24.9318762Z C:\LR\MMS\Services\Mms\TaskAgentProvisioner\Tools\agents\2.112.0\externals\nuget\NuGet.exe pack "D:\a\1\s\src\app\Ormie\Ormie.csproj" -OutputDirectory "D:\a\1\s" -Properties Configuration=release
2017-02-22T21:43:25.5460318Z MSBuild auto-detection: using msbuild version '14.0' from 'C:\Program Files (x86)\MSBuild\14.0\bin'.
2017-02-22T21:43:25.5460318Z Attempting to build package from 'Ormie.csproj'.
2017-02-22T21:43:25.7480272Z Packing files from 'D:\a\1\s\src\app\Ormie\bin\Release'.
2017-02-22T21:43:25.9040273Z Using 'Ormie.nuspec' for metadata.
2017-02-22T21:43:26.1645370Z ##[error]'System.Collections' already has a dependency defined for 'Microsoft.NETCore.Platforms'.
2017-02-22T21:43:26.1865365Z ##[error]System.Exception: Unexpected exit code 1 returned from tool NuGet.exe
2017-02-22T21:43:26.1865365Z    at Microsoft.TeamFoundation.DistributedTask.Task.Internal.InvokeToolCmdlet.ProcessRecord()
2017-02-22T21:43:26.1865365Z    at System.Management.Automation.CommandProcessor.ProcessRecord()
2017-02-22T21:43:26.2015355Z ##[error]PowerShell script completed with 1 errors.
2017-02-22T21:43:26.2025352Z ##[section]Finishing: NuGet Packager 

In order to understand what was happening, I tried to create the package in my development box, using NuGet version 3.3, and got a similar message. So, I've updated NuGet to version 3.5, tried to pack in my machine and it worked just fine.
So, my questions are:

• Is there any kind of configuration in Team Services Build Definition that can be done to solve this issue?
• How can I force the Hosted build agent to use version 3.5 in the NuGet Packager task?

Answer 1

To use nuget3.5 for nugget packager task, you can add nugget.exe to source control, and then use $(Build.SourcesDirectory)\nuget.exe as path to nugget.exe.

For Nuget Restore and Nuget Publisher Tasks, they define 3.3 and 3.5 in their tasks. You can view task.json for all tasks definitions in VSTS task.

If you want Nuget Packager also can choose nugget version, you should develop your own task same as Nuget Packager function and with nuget version to choose.