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System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NotImplementedException: The method or operation is not implemented.
   at MonoDevelop.Ide.TypeSystem.CodeGenerationService.GetNewMethodPosition(IEnumerable`1 points, IUnresolvedTypeDefinition cls)
   at MonoDevelop.Ide.TypeSystem.CodeGenerationService.GetSuitableInsertionPoint(IEnumerable`1 points, IUnresolvedTypeDefinition cls, IUnresolvedMember member)
   at MonoDevelop.Ide.TypeSystem.CodeGenerationService.AddNewMember(ITypeDefinition type, IUnresolvedTypeDefinition part, IUnresolvedMember newMember, Boolean implementExplicit)
   at MonoDevelop.GtkCore.GuiBuilder.CodeBinder.BindSignal(Signal signal)
   at MonoDevelop.GtkCore.GuiBuilder.GuiBuilderView.OnSignalAdded(Object sender, ComponentSignalEventArgs args)
   at Stetic.WidgetDesigner.OnSignalAdded(Object sender, ComponentSignalEventArgs args)
   at Stetic.Project.<>c__DisplayClass12.<NotifySignalAdded>b__11(Object , EventArgs )
   at Stetic.GuiDispatch.InvokeSync(EventHandler h)
   at Stetic.Project.NotifySignalAdded(Object obj, String name, Signal signal)
   at Stetic.ProjectBackend.Stetic.IProject.NotifySignalAdded(SignalEventArgs args)
   at Stetic.ObjectWrapper.OnSignalAdded(SignalEventArgs args)
   at Stetic.SignalCollection.OnInsertComplete(Int32 index, Object value)
   at System.Collections.CollectionBase.System.Collections.IList.Add(Object value)
   at Stetic.SignalCollection.Add(Signal signal)
   at Stetic.SignalsEditorBackend.AddHandler(TreeIter iter, String name)
   at Stetic.SignalsEditorBackend.OnRowActivated(Object sender, RowActivatedArgs args)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
   at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at GLib.Signal.ClosureInvokedCB(Object o, ClosureInvokedArgs args)
   at GLib.SignalClosure.Invoke(ClosureInvokedArgs args)
   at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)