I'm getting this error on Release build:
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: The "LinkAssemblies" task failed unexpectedly.
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: System.ArgumentException: Empty name
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.Mixin.CheckName(String name)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.ModuleDefinition.GetType(String namespace, String name)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.MetadataResolver.GetTypeDefinition(ModuleDefinition module, TypeReference type)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.MetadataResolver.GetType(ModuleDefinition module, TypeReference reference)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.MetadataResolver.Resolve(TypeReference type)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.ModuleDefinition.Resolve(TypeReference type)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Cecil.TypeReference.Resolve()
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Linker.Steps.SweepStep.ResolveAllTypeReferences(AssemblyDefinition assembly)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Linker.Steps.SweepStep.Process()
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Mono.Linker.Pipeline.Process(LinkContext context)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at MonoDroid.Tuner.Linker.Process(LinkerOptions options, LinkContext& context)
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Xamarin.Android.Tasks.LinkAssemblies.Execute()
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1586,5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext()
I'm using Visual Studio 2015 with Xamarin Android v4.2.2.11 (file Xamarin.VisualStudio_4.2.2.11.msi) with MSBuild 2015 and .NET Reactor. Project is setup to use .NET FX v4.6.1 and Android Target v5.1 (API 22) and minimum version v4.4 (API 19).