Xamarin iOS project builds fine in VS2019 but Azure Devops Xamarin.iOS build on same mac fails

[charristti]

Describe the bug

When building using a build agent on mac. Pharmacist fails with the following exception:

"/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.iOS/FTAApp.iOS.csproj" (default target) (1:7) ->
"/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp/FTAApp.csproj" (default target) (3:10) ->
"/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.Events/FTAApp.Events.csproj" (default target) (8:6) ->
(GeneratePharmacist target) -> 
  /Users/fmsdeveloper/.nuget/packages/pharmacist.msbuild/1.0.118/buildTransitive/netstandard2.0/Pharmacist.MSBuild.targets(46,5): error : PharmacistNuGetTask: System.TypeInitializationException: The type initializer for 'Pharmacist.Core.NuGet.NuGetPackageHelper' threw an exception. ---> System.MissingMethodException: Method not found: System.Collections.Generic.IEnumerable`1<NuGet.Configuration.Settings> NuGet.Configuration.XPlatMachineWideSetting.get_Settings() [/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.Events/FTAApp.Events.csproj]
/Users/fmsdeveloper/.nuget/packages/pharmacist.msbuild/1.0.118/buildTransitive/netstandard2.0/Pharmacist.MSBuild.targets(46,5): error :    --- End of inner exception stack trace --- [/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.Events/FTAApp.Events.csproj]
/Users/fmsdeveloper/.nuget/packages/pharmacist.msbuild/1.0.118/buildTransitive/netstandard2.0/Pharmacist.MSBuild.targets(46,5): error :   at Pharmacist.Core.Extractors.NuGetExtractor.Extract (System.Collections.Generic.IReadOnlyCollection`1[T] targetFrameworks, System.Collections.Generic.IReadOnlyCollection`1[T] packages, System.String packageOutputDirectory) [0x00011] in <02068e4e71d14f93bcb53e5fe98ec7dc>:0  [/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.Events/FTAApp.Events.csproj]
/Users/fmsdeveloper/.nuget/packages/pharmacist.msbuild/1.0.118/buildTransitive/netstandard2.0/Pharmacist.MSBuild.targets(46,5): error :   at Pharmacist.Core.ObservablesForEventGenerator.ExtractEventsFromNuGetPackages (System.IO.TextWriter writer, System.Collections.Generic.IReadOnlyCollection`1[T] packages, System.Collections.Generic.IReadOnlyCollection`1[T] frameworks, System.String packageOutputFolder) [0x00090] in <02068e4e71d14f93bcb53e5fe98ec7dc>:0  [/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.Events/FTAApp.Events.csproj]
/Users/fmsdeveloper/.nuget/packages/pharmacist.msbuild/1.0.118/buildTransitive/netstandard2.0/Pharmacist.MSBuild.targets(46,5): error :   at Pharmacist.MsBuild.PharmacistNuGetTask.Execute () [0x0014b] in <d801f7198a52487083dbe2f636ec67bf>:0  [/Users/fmsdeveloper/myagent/_work/1/s/SourceFTAApp/FTAApp/FTAApp.Events/FTAApp.Events.csproj]

Steps To Reproduce

Build Xamarin Forms iOS project using Xamarin.iOS Azure Devops Task.

Expected behavior

Should build without error.

Works fine when building in the VS2019 environment with the same mac paired

Screenshots

Environment

• OS:
• Version
• Device:

Additional context

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[glennawatson]

Thanks. This is due to mono not having until recently strict nuget resolution. So it's msbuild uses a different version of the nuget library where they have breaking API and the first DLL version loaded is the one used for the nuget package.

They turned on strict resolution on mono 6 so even if a DLL with the same name is loaded if the versions don't match it will do a load of the correct version.

I will be upgrading soon to nuget 5 the version msbuild is using anyway.