Build fails with SocketLite

[Huii]

I would like to use SocketLite and installed its Nuget package. However, whenever I attempt to rebuild my project it fails with the following message:

Can not resolve reference: System.Threading.Tasks.Extensions, referenced by System.Reactive. Please add a NuGet package or assembly reference for System.Threading.Tasks.Extensions, or remove the reference to System.Reactive. PrimsaAndroid.Android

The following packages are installed:

Id                                     Versions           
--                                     --------           
SocketLite.PCL                         {5.1.1}            
NETStandard.Library                    {2.0.3}            
Xamarin.Forms                          {3.4.0.925479-pre1}
Microsoft.AspNetCore.WebSockets.Server {0.1.0}            
System.Threading.Tasks.Extensions      {4.5.1}            
Xamarin.Android.Support.Design         {28.0.0-preview5}  
Xamarin.Android.Support.v7.AppCompat   {28.0.0-preview5}  
Xamarin.Android.Support.v4             {28.0.0-preview5}  
Xamarin.Android.Support.v7.CardView    {28.0.0-preview5}  
Xamarin.Android.Support.v7.MediaRouter {28.0.0-preview5}

Thank you very much for your help.

[namilkimfree]

i has same issue on version 5.1.1

@1iveowl Thank you very much for your help.