ExecutionEngineException: Attempting to JIT compile method '(wrapper unknown) LibVLCSharp.Shared.DialogCallbacks:StructureToPtr To stop App in IOS

please help me to fix This bug.

I have a camera ip use http type "http://192.168.0.153/xxx", This camera have certificate http I The camera run in Sarafi in IOS then run ok when I buld in xamarin user libvlcCshap then have a bug, the app in iphone to stop when open camera This is my code:

Core.Initialize();
var tcs = new TaskCompletionSource<bool>();
LibVLC = new LibVLC();
 try
{
      LibVLC.SetDialogHandlers((title, text) => Task.CompletedTask,
      (dialog, title, text, username, store, token) =>
       {
               // show UI dialog
                    // On "OK" call PostLogin
                    dialog.PostLogin("MyCamera", "12345678", false);
                    tcs.TrySetResult(true);
                    return Task.CompletedTask;
        },
(dialog, title, text, type, cancelText, actionText, secondActionText, token) => Task.CompletedTask,
(dialog, title, text, indeterminate, position, cancelText, token) => Task.CompletedTask,(dialog, position, text) => Task.CompletedTask);

MediaPlayer = new MediaPlayer(LibVLC)
  {
    Media = new Media(LibVLC,
     @"http://192.168.0.253/nphMotionJpeg?Resolution=640x480&Quality=Standard",
      FromType.FromLocation)
};
 MediaPlayer.Play();

  await tcs.Task;

The App begin to stop when 
MediaPlayer.Play();
await tcs.Task;

Relevant logs and/

System.ExecutionEngineException: Attempting to JIT compile method '(wrapper unknown) LibVLCSharp.Shared.DialogCallbacks:StructureToPtr (object,intptr,bool)' while running in aot-only mode. See https://docs.microsoft.com/xamarin/ios/internals/limitations for more information.

at (wrapper managed-to-native) System.Runtime.InteropServices.Marshal.StructureToPtr(object,intptr,bool) at System.Runtime.InteropServices.Marshal.StructureToPtr[T] (T structure, System.IntPtr ptr, System.Boolean fDeleteOld) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.4.0.64/src/Xamarin.iOS/mcs/class/corlib/System.Runtime.InteropServices/Marshal.cs:1229 at LibVLCSharp.Shared.LibVLC.SetDialogHandlers (LibVLCSharp.Shared.DisplayError error, LibVLCSharp.Shared.DisplayLogin login, LibVLCSharp.Shared.DisplayQuestion question, LibVLCSharp.Shared.DisplayProgress displayProgress, LibVLCSharp.Shared.UpdateProgress updateProgress) [0x0 00f1] in <1b469c787fe4469d94bf00a7bbdf9fb2>:0 at anFa.View.Dialogue.Device.MainViewModel+d__21.MoveNext () [0x00053] in C:.................................\MainViewModel.cs:49

Environment

• OS: IOS 12.1
• Version 12.1
• Device: Iphone 6S
• LibVLC version and architecture
• LibVLCSharp version 3.02

Possible fixes

Please help me about This bug