title: The "ResolveLibraryProjectImports" task failed unexpectedly
body: <p>I have a Xamarin project, which is based on <code>MvvmCross</code>. The project is for both iOS and Android. I opened this project in Visual Studio 15. I got some errors, which I solved in no time. There are some errors, which are stuck and I couldn't solve them even after searching on Google and on Stackoverflow. I have tried each and every method found on Stackoverflow, but still all remaining errors are there.
  This project is using 3rd party libraries like RestSharp and BoxApi.V2 (few more)</p>
  
  <p>I am posting my error log below.</p>
  
  <pre><code>Severity    Code    Description Project File    Line    Suppression State
  Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
  System.IO.FileNotFoundException: Could not load assembly 'RestSharp(Android), Version=0.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
  File name: 'RestSharp(Android).dll'
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName, ReaderParameters parameters)
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.GetAssembly(String fileName)
     at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Extract(DirectoryAssemblyResolver res, ICollection`1 jars, ICollection`1 resolvedResourceDirectories, ICollection`1 resolvedAssetDirectories, ICollection`1 resolvedEnvironments)
     at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Execute()
     at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
     at Microsoft.Build.BackEnd.TaskBuilder.&lt;ExecuteInstantiatedTask&gt;d__26.MoveNext() BoxApi.V2 (Android)
  </code></pre>
  
  <p>This error is repeating for all projects included in this solution. So I am getting this error multiple times.      </p>
  
  <p>I also want to add that the project was previously built on MAC and I am using windows, does this make some compatibility or cross OS issue?
  I have checked all assembly references and all are working fine.</p>