Web view not working on droid

Hi,

I have my web view set to point to an external URL using Source = "http://news.bbc.o.uk". On iOS, I have this working, but on droid I constantly get a crash

Could not load signature of Xamarin.Forms.Platform.Android.FormsWebChromeClient:OnShowFileChooser due to: Failed for unknown reasons. assembly: type:FileChooserParams member:
[webkit] BrowserFrame constructor: this=Handler (android.webkit.BrowserFrame) {42d71678}

[MonoDroid] UNHANDLED EXCEPTION:
[MonoDroid] System.TypeLoadException: Could not load type 'Xamarin.Forms.Platform.Android.FormsWebChromeClient' from assembly 'Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'.
[MonoDroid] at Xamarin.Forms.Platform.Android.WebViewRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs

1 e) [0x00036] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x000fc] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in <filename unknown>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.NavigationRenderer.SwitchContentAsync (Xamarin.Forms.Page view, Boolean animated, Boolean removed) [0x00028] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.NavigationRenderer.OnPushAsync (Xamarin.Forms.Page view, Boolean animated) [0x00000] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.NavigationRenderer.PushViewAsync (Xamarin.Forms.Page page, Boolean animated) [0x00000] in :0
[MonoDroid] at Xamarin.Forms.Platform.Android.NavigationRenderer.OnPushed (System.Object sender, Xamarin.Forms.NavigationRequestedEventArgs e) [0x0000e] in :0
[MonoDroid] at Xamarin.Forms.NavigationPage+d__66.MoveNext () [0x00065] in :0
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in :0
[MonoDroid] at Xamarin.Forms.NavigationPage+d__65.MoveNext () [0x001c4] in :0
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in :0
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in :0
[MonoDroid] at turtlewax.DetailPage+c__async10.MoveNext () [0x00031] in /Users/PFJ/Developer/mosquito/turtlewax/turtlewax/UserInterface/Main/DetailPage.cs:237
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
[MonoDroid] at System.Runtime.CompilerServices.AsyncMethodBuilderCore.m__0 (System.Object state) [0x00000] in :0
[MonoDroid] at Android.App.SyncContext+c__AnonStorey0.<>m__0 () [0x00000] in /Users/builder/data/lanes/2692/50280e42/source/monodroid/src/Mono.Android/src/Android.App/SyncContext.cs:18
[MonoDroid] at Java.Lang.Thread+RunnableImplementor.Run () [0x0000b] in /Users/builder/data/lanes/2692/50280e42/source/monodroid/src/Mono.Android/src/Java.Lang/Thread.cs:36
[MonoDroid] at Java.Lang.IRunnableInvoker.n_Run (IntPtr jnienv, IntPtr native__this) [0x00009] in /Users/builder/data/lanes/2692/50280e42/source/monodroid/src/Mono.Android/platforms/android-18/src/generated/Java.Lang.IRunnable.cs:71
[MonoDroid] at (wrapper dynamic-method) System.Object:c3732e79-ee84-4cbb-a432-f3baed001048 (intptr,intptr)
[mono]
[mono] Unhandled Exception:
[mono] System.TypeLoadException: Could not load type 'Xamarin.Forms.Platform.Android.FormsWebChromeClient' from assembly 'Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'.
[mono] at Xamarin.Forms.Platform.Android.WebViewRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs

1 e) [0x00036] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x000fc] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in :0
[mono] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in :0
[mono] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <filename unknown>:0 
[mono]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in :0
[mono] at Xamarin.Forms.Pla
[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: Could not load type 'Xamarin.Forms.Platform.Android.FormsWebChromeClient' from assembly 'Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'.
[mono-rt] at Xamarin.Forms.Platform.Android.WebViewRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs

1 e) [0x00036] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x000fc] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x00118] in :0
[mono-rt] at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, Boolean sameChildren) [0x00023] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0010d] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <filename unknown>:0 
[mono-rt]   at Xamarin.Forms.Platform.Android.VisualElementRenderer

1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in :0

I have the app min set to 4.0.3 with the target at the latest version (6.0)

Any ideas?