Installation failed in docky 2.0.11. libgtk2.0-bin version: 2.22 python-gtk2 version: 2.21.0 I have got the following error message: [Info 12:38:40.432] [HelperService] Trying to install: /home/geza/Letöltések/136816-audacious.tar Marshaling clicked signal Exception in Gtk# callback delegate Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object at Docky.ConfigurationWindow.OnInstallClicked (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0 at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0 at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0 at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in <filename unknown>:0 at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0 at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0 at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000] in <filename unknown>:0 at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal) at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) at Gtk.Application.gtk_main() at Gtk.Application.Run() at Docky.Docky.Main(System.String[] args) Cairo.Context: called from finalization thread, programmer is missing a call to Dispose Cairo.Context: called from finalization thread, programmer is missing a call to Dispose Cairo.Context: called from finalization thread, programmer is missing a call to Dispose Cairo.Context: called from finalization thread, programmer is missing a call to Dispose Cairo.Context: called from finalization thread, programmer is missing a call to Dispose Cairo.Context: called from finalization thread, programmer is missing a call to Dispose Cairo.Context: called from finalization thread, programmer is missing a call to Dispose