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"LinkAssemblies" task failed unexpectedly. System.NullReferenceException: Object reference not set

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Hi,
After updating to the latest Xamarin I'm now unable to do a release build on either Visual Studio 2015 or 2017.
Please see below the output log using SDK Assemblies Only.

I am using a Min build of 21 and a Target of "Use Compile SDK version" of which I'm compiling using 7.1.

Any ideas?

Thanks

EnableProguard: False (TaskId:453)
3> ProguardConfiguration: (TaskId:453)
3> DumpDependencies: False (TaskId:453)
3> LinkOnlyNewerThan: (TaskId:453)
3> HttpClientHandlerType: (TaskId:453)
3> TlsProvider: (TaskId:453)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: The "LinkAssemblies" task failed unexpectedly.
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: System.NullReferenceException: Object reference not set to an instance of an object.
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Mono.Linker.Steps.ResolveFromAssemblyStep.ProcessLibrary(LinkContext context, AssemblyDefinition assembly)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Mono.Tuner.CustomizeActions.ProcessUserAssembly(AssemblyDefinition assembly)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Mono.Tuner.CustomizeActions.ProcessAssembly(AssemblyDefinition assembly)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Mono.Linker.Pipeline.Process(LinkContext context)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at MonoDroid.Tuner.Linker.Run(Pipeline pipeline, LinkContext context)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at MonoDroid.Tuner.Linker.Process(LinkerOptions options, LinkContext& context)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Xamarin.Android.Tasks.LinkAssemblies.Execute()
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
3>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1569,5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext()
3>Done executing task "LinkAssemblies" -- FAILED. (TaskId:453)
3>Done building target "_LinkAssembliesShrink" in project "Colas.Carl.Droid.csproj" -- FAILED.: (TargetId:420)


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