title: Can't build "hello world" Xamarin app for Android
body: <p>I get this error:</p>
  
  <pre><code>Severity    Code    Description Project File    Line    Suppression State
  Error       The "Javac" task failed unexpectedly.
  System.IO.PathTooLongException: The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.
     at System.IO.LongPathHelper.Normalize(String path, UInt32 maxPathLength, Boolean checkInvalidCharacters, Boolean expandShortPaths)
     at System.IO.Path.NewNormalizePath(String path, Int32 maxPathLength, Boolean expandShortPaths)
     at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
     at System.IO.Path.GetFullPathInternal(String path)
     at System.IO.FileInfo.Init(String fileName, Boolean checkHost)
     at System.IO.FileInfo..ctor(String fileName)
     at Xamarin.Android.Tasks.ZipArchiveEx.AddFiles(String folder, String folderInArchive)
     at Xamarin.Android.Tasks.ZipArchiveEx.AddDirectory(String folder, String folderInArchive)
     at Xamarin.Android.Tasks.Javac.Execute()
     at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
     at Microsoft.Build.BackEnd.TaskBuilder.&lt;ExecuteInstantiatedTask&gt;d__26.MoveNext() XamarinApp1.Android     
  </code></pre>
  
  <p>The name of my app is XamarinApp1; surely that's not too long?</p>
  
  <p>This is an out of the box default Xamarin Android XAML project... no changes to the template; I just tried to build it...</p>