title: The "GenerateJavaStubs" task failed unexpectedly
body: <p>I have created one new project in Visual studio and only che in <code>.xml</code> file (put two frame layouts) and when i debug the code i have one error, please told me the solution</p>
  
  <pre><code>Error   1   The "GenerateJavaStubs" task failed unexpectedly.
  System.InvalidOperationException: Sequence contains no elements
  at System.Linq.Enumerable.Max(IEnumerable`1 source)
  at Xamarin.Android.Tools.TypeNameMapGenerator.WriteBinaryMapping(Stream o, Dictionary`2 mapping)
  at Xamarin.Android.Tools.TypeNameMapGenerator.WriteJavaToManaged(Stream output)
  at Xamarin.Android.Tasks.GenerateJavaStubs.UpdateWhenChanged(String path, Action`1 generator)
  at Xamarin.Android.Tasks.GenerateJavaStubs.WriteTypeMappings(List`1 types)
  at Xamarin.Android.Tasks.GenerateJavaStubs.Run()
  at Xamarin.Android.Tasks.GenerateJavaStubs.Execute()
  at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
  at Microsoft.Build.BackEnd.TaskBuilder.&lt;ExecuteInstantiatedTask&gt;d__20.MoveNext()    TMS_TabletView.Droid
  </code></pre>