System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentNullException: Argument cannot be null.
Parameter name: keyring
  at Gnome.Keyring.Ring.DeleteItem (System.String keyring, Int32 id) [0x00000] 
  at bareFTP.Preferences.PwdBackend.CleanUpItems () [0x00000] 
  at bareFTP.Preferences.Bookmarks.Bookmarks.SavePasswords (System.Xml.XmlDocument doc) [0x00000] 
  at bareFTP.Preferences.Bookmarks.Bookmarks.Save (System.Xml.XmlDocument doc) [0x00000] 
  at bareFTP.Preferences.Bookmarks.Bookmarks.Save (Boolean use_keyring) [0x00000] 
  at bareFTP.Preferences.Config.set_General_UseGnomeKeyring (Boolean value) [0x00000] 
  at bareFTP.Gui.Preferences.PreferencesDialog.on_use_gnome_keyring_toggled (System.Object sender, System.EventArgs e) [0x00000] 
  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] 
  --- 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] 
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] 
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000] 
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000] 
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] 
  at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000] 
  at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000] 
  at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000]