Hi,
I have a textfield, a slider and a checkbox. The textfield and slider are connected through bindings using Model Key Path. That works fine, but when I change the value (other than the initial one)and then click the checkbox I get the following error : Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object at (wrapper unknown) int:PtrToStructure (intptr,object) at (wrapper managed-to-native) System.Runtime.InteropServices.Marshal:PtrToStructure(intptr,System.Type ) at Monobjc.Dynamic.Proxies.Test.Mac.ApplicationController.ImportMembers(Tes t.Mac.ApplicationController instance) [0x00000] at Monobjc.Dynamic.Proxies.Test.Mac.ApplicationController.CheckClicked(IntP tr receiver, IntPtr selector) [0x00000] at (wrapper native-to-managed)Monobjc.Dynamic.Proxies.Test.Mac.ApplicationController :CheckClicked(intptr,intptr) at (wrapper managed-to-native) 503BA7BB:pinvoke (intptr,intptr) at 503BA7BB.objc_msgSend (IntPtr receiver, IntPtr selector, System.Object[] parameters) [0x00000] at Monobjc.Bridge.Generators.DynamicMessagingGenerator.SendMessage(System.S tring message, IntPtr receiver, IntPtr selector, System.Object[] parameters) 0x00000] at Monobjc.ObjectiveCRuntime.SendMessage (IManagedWrapper receiver, System.String selector, System.Object[] parameters) [0x00000] at Monobjc.Cocoa.NSApplication.Run () [0x00000] at Monobjc.Cocoa.NSApplication.RunApplication () [0x00000] at Test.Mac.Program.Main (System.String[] args) [0x00000] What is causing this problem ? Br, Mario

