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NullReferenceException
System.NullReferenceException: Object reference not set to an instance of an object
at MonoTouch.Design.Client.PropertyResolver.get_UIKitObject () [0x0000d] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/PropertyResolver.cs:39
at MonoTouch.Design.Client.PropertyResolver.GetValue (System.String propertyName) [0x0005e] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/PropertyResolver.cs:91
at MonoTouch.Design.Client.UIBaseControllerPropertyResolver.GetValue (System.String propertyName) [0x001de] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/PropertyResolvers/UIBaseControllerPropertyResolver.cs:94
at MonoTouch.Design.Client.UINavigationControllerPropertyResolver.GetValue (System.String propertyName) [0x00003] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/PropertyResolvers/UINavigationControllerPropertyResolver.cs:17
at MonoTouch.Design.Client.IPhoneDesignerItem.GetPropertyValue (System.String name) [0x00198] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/DesignerItems/IPhoneDesignerItem.cs:331
at MonoTouch.Design.Client.ViewControllerDesignerItem.get_DisplayName () [0x00007] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/DesignerItems/ViewControllerDesignerItem.cs:24
at MonoTouch.Design.Client.IPhoneDesignerSurface.DrawContent (Xwt.Drawing.Context ctx) [0x0006e] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSurface.cs:242
at Xamarin.Designer.DesignerSurface.Draw (Xwt.Drawing.Context ctx, Rectangle dirtyRect) [0x00087] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer/Xamarin.Designer/DesignerSurface.cs:1956
at Xamarin.Designer.DesignerSurface.OnDraw (Xwt.Drawing.Context ctx, Rectangle dirtyRect) [0x0000a] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/md-addins/Xamarin.Designer/Xamarin.Designer/DesignerSurface.cs:1930
at Xwt.Canvas+WidgetBackendHost.OnDraw (System.Object context, Rectangle dirtyRect) [0x0002a] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/monodevelop/main/external/xwt/Xwt/Xwt/Canvas.cs:49
at Xwt.GtkBackend.CustomCanvas+<OnExposeEvent>c__AnonStorey1E.<>m__24 () [0x0004b] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/monodevelop/main/external/xwt/Xwt.Gtk/Xwt.GtkBackend/CanvasBackend.cs:167
at Xwt.Toolkit.Invoke (System.Action a) [0x00015] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.8-branch/a11bc57d/source/monodevelop/main/external/xwt/Xwt/Xwt/Toolkit.cs:260
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