title: Cant Build my App in Release mode
body: <p>My App works fine in debug mode, but if i want to build it in release i get the following error:</p>
  
  <pre><code>Fehler  1   Unerwarteter Fehler bei der LinkAssemblies-Aufgabe.
  Java.Interop.Tools.Diagnostics.XamarinAndroidException: error XA2006: Could not resolve reference to 'System.Void Xamarin.Forms.Element::set_AutomationId(System.String)' (defined in assembly 'ZXing.Net.Mobile.Forms, Version=2.1.47.0, Culture=neutral, PublicKeyToken=null') with scope 'Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'. When the scope is different from the defining assembly, it usually means that the type is forwarded. ---&gt; Mono.Cecil.ResolutionException: Failed to resolve System.Void Xamarin.Forms.Element::set_AutomationId(System.String)
     bei Mono.Linker.Steps.MarkStep.MarkMethod(MethodReference reference)
     bei Mono.Linker.Steps.MarkStep.MarkInstruction(Instruction instruction)
     bei Mono.Linker.Steps.MarkStep.MarkMethodBody(MethodBody body)
     bei Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method)
     bei Mono.Linker.Steps.MarkStep.ProcessQueue()
     bei Mono.Linker.Steps.MarkStep.Process()
     bei Mono.Linker.Steps.MarkStep.Process(LinkContext context)
     bei MonoDroid.Tuner.MonoDroidMarkStep.Process(LinkContext context)
     bei Mono.Linker.Pipeline.Process(LinkContext context)
     bei MonoDroid.Tuner.Linker.Process(LinkerOptions options, LinkContext&amp; context)
     bei Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
     --- Ende der internen Ausnahmestapelüberwachung ---
     bei Java.Interop.Tools.Diagnostics.Diagnostic.Error(Int32 code, Exception innerException, String message, Object[] args)
     bei Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
     bei Xamarin.Android.Tasks.LinkAssemblies.Execute()
     bei Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
     bei Microsoft.Build.BackEnd.TaskBuilder.&lt;ExecuteInstantiatedTask&gt;d__20.MoveNext()    Euroscola_App1
  </code></pre>
  
  <p>This problem exists since today, i dont know if the reason is that i downloaded a newer Xamarin version or because i have installed the ZXing Package.</p>