Error when till this line of code ( return base.FinishedLaunching(app, options);) in ApPDelegate.cs. Anyone know what is happening?
{System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.PlatformNotSupportedException: This API is not supported on this version of iOS
at UIKit.UIMenuElement..ctor (System.IntPtr handle) [0x00007] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.2.0.42/src/Xamarin.iOS/UIMenuElement.g.cs:91
at UIKit.UICommand..ctor (System.IntPtr handle) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.2.0.42/src/Xamarin.iOS/UICommand.g.cs:88
at UIKit.UIKeyCommand..ctor (System.IntPtr handle) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.2.0.42/src/Xamarin.iOS/UIKeyCommand.g.cs:91
at (wrapper managed-to-native) System.Reflection.RuntimeConstructorInfo.InternalInvoke(System.Reflection.RuntimeConstructorInfo,object,object[],System.Exception&)
at System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) [0x00005] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:936
--- End of inner exception stack trace ---
at System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) [0x00018] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:944
at System.Reflection.RuntimeConstructorInfo.DoInvoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00086] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:926
at System.Reflection.RuntimeConstructorInfo.Invoke (System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:960
at System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) [0x00000] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/external/corefx/src/Common/src/CoreLib/System/Reflection/ConstructorInfo.cs:22
at ObjCRuntime.Runtime.ConstructNSObject[T] (System.IntPtr ptr, System.Type type, ObjCRuntime.Runtime+MissingCtorResolution missingCtorResolution) [0x0003b] in <1b20576ce73640d782f136af13e79af3>:0
at ObjCRuntime.Runtime.GetNSObject[T] (System.IntPtr ptr) [0x000d1] in <1b20576ce73640d782f136af13e79af3>:0
at UIKit.UIKeyCommand.Create (Foundation.NSString keyCommandInput, UIKit.UIKeyModifierFlags modifierFlags, ObjCRuntime.Selector action) [0x0003b] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.2.0.42/src/Xamarin.iOS/UIKeyCommand.g.cs:107
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement]..ctor () [0x00043] in :0
at Xamarin.Forms.Platform.iOS.Platform+DefaultRenderer..ctor () <0x1288654 + 0x0004f> in <a0d1cb457ddf4ad79bca434d164a3ac7#b407754871cbce7e00b24f0c95ae5f7b>:0
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00000] in 
\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:187
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in \a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in \a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:46
at Xamarin.Forms.Platform.iOS.PageRenderer.ViewDidLoad () [0x0008f] in \a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:238
at (wrapper managed-to-native) ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper(intptr,intptr)
at UIKit.UIViewController.get_View () [0x0002a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.2.0.42/src/Xamarin.iOS/UIViewController.g.cs:3171
at Xamarin.Forms.Platform.iOS.PageRenderer.get_NativeView () [0x00000] in \a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:104
at Xamarin.Forms.Platform.iOS.PageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0003d] in \a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:120
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in \a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:188
at Xamarin.Forms.Platform.iOS.Platform.AddChild (Xamarin.Forms.VisualElement view) [0x00027] in \a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:300
at Xamarin.Forms.Platform.iOS.Platform.WillAppear () [0x0003c] in \a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:286
at Xamarin.Forms.Platform.iOS.PlatformRenderer.ViewWillAppear (System.Boolean animated) [0x00010] in \a\1\s\Xamarin.Forms.Platform.iOS\PlatformRenderer.cs:86
at (wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend(intptr,intptr)
at UIKit.UIWindow.MakeKeyAndVisible () [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.2.0.42/src/Xamarin.iOS/UIWindow.g.cs:281
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.SetMainPage () [0x00006] in \a\1\s\Xamarin.Forms.Platform.iOS\FormsApplicationDelegate.cs:171
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.FinishedLaunching (UIKit.UIApplication uiApplication, Foundation.NSDictionary launchOptions) [0x00030] in \a\1\s\Xamarin.Forms.Platform.iOS\FormsApplicationDelegate.cs:57
at SMAT.iOS.AppDelegate.FinishedLaunching (UIKit.UIApplication app, Foundation.NSDictionary options) [0x0004c] in \WingLun\SMAT\SMAT\SMAT.iOS\AppDelegate.cs:36 }