Docky crashes - System.Exception: org.freedesktop.DBus.Error.UnknownMethod: Method "Get" with signature "ss" on interface "org.freedesktop.UPower" doesn't exist

[Prem Anand]

[ERROR] FATAL UNHANDLED EXCEPTION: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Exception: org.freedesktop.DBus.Error.UnknownMethod: Method "Get" with signature "ss" on interface "org.freedesktop.UPower" doesn't exist

  at Docky.Services.SystemService+IUPowerProxy.Get (System.String interface, System.String propname) [0x00000] in <filename unknown>:0
  at Docky.Services.SystemService.HandleUPowerChanged () [0x00000] in <filename unknown>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,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 (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x0012f>
at System.Reflection.MethodBase.Invoke (object,object[]) <0x0002a>
at System.Delegate.DynamicInvokeImpl (object[]) <0x00203>
at System.MulticastDelegate.DynamicInvokeImpl (object[]) <0x0003b>
at System.Delegate.DynamicInvoke (object[]) <0x00018>
at DBus.Connection.HandleSignal (DBus.Protocol.Message) <0x0031f>
at DBus.Connection.DispatchSignals () <0x0005f>
at DBus.Connection.Iterate () <0x0002f>
at DBus.BusG/<Init>c__AnonStorey0.<>m__0 (intptr,DBus.GLib.IOCondition,intptr) <0x0003b>
at (wrapper native-to-managed) DBus.BusG/<Init>c__AnonStorey0.<>m__0 (intptr,DBus.GLib.IOCondition,intptr) <0x0008a>
at (wrapper managed-to-native) Gtk.Application.gtk_main () <0x00054>
at Gtk.Application.Run () <0x0000b>
at Docky.Docky.Main (string[]) <0x005cb>

[Prem Anand (h.prem.anand)]

Version:
[Info 11:08:56.533] Docky version: 2.2.0 Release
[Info 11:08:56.547] Kernel version: 3.13.0.4
[Info 11:08:56.548] CLR version: 4.0.30319.17020

[Prem Anand (h.prem.anand)]

By the way, the crash happens only when I plug in or plug out my power card

[aivan (ivan-arandjelovic)]

Yup, exactly the same question in my case too.

[owen rumney (o-owen)]

I have this same issue with essentially the same stack. The issue also only occurs when I toggle to powercord

[Adi S. (adizere)]

Version information. Also notice the error upon initialization.

$ docky --version
[Info 15:03:39.435] Docky version: 2.2.1 bzr docky r1845 ppa
[Info 15:03:39.462] Kernel version: 3.2.0.58
[Info 15:03:39.463] CLR version: 4.0.30319.1
[Debug 15:03:39.667] [UserArgs] BufferTime = 0
[Debug 15:03:39.667] [UserArgs] MaxSize = 2147483647
[Debug 15:03:39.667] [UserArgs] NetbookMode = False
[Debug 15:03:39.667] [UserArgs] NoPollCursor = False
[Error 15:03:39.681] [SystemService] Could not initialize power manager dbus: 'org.freedesktop.DBus.Error.UnknownMethod: Method "Get" with signature "ss" on interface "org.freedesktop.UPower" doesn't exist
'
[Info 15:03:39.682] [SystemService] at Docky.Services.SystemService+IUPowerProxy.Get (System.String interface, System.String propname) [0x00000] in <filename unknown>:0
  at Docky.Services.SystemService.HandleUPowerChanged () [0x00000] in <filename unknown>:0
  at Docky.Services.SystemService.InitializeBattery () [0x00000] in <filename unknown>:0
[Info 15:03:39.707] [ThemeService] Setting theme: Matte

[Weston Bustraan (wbustraan)]

See https://bugs.launchpad.net/docky/+bug/1309706/comments/2 for a fix

[Minium (minium)]

Indeed, Docky crashes each time my laptop goes into suspend and whenever I plug-in/plug-out the power cord.

[Minium (minium)]

For everybody that is still annoyed with this problem, you can give my use my personal repository a shot.
I've adopted in it the fix pointed out in comment #6.

[WHK (yan-uniko-102)]

will be celebrating the birthday of this bug?

[ニコラス (nrlemo)]

Hello
I was able to fix this by doing what Weston Bustraan (wbustraan) says on Bug #1309706:
You must download the source code, modify the SystemService.cs file..
hope that helps!

QUOTE

Weston Bustraan (wbustraan) wrote on 2014-04-30: #2

I was able to fix it without commenting out the code.

In Docky.Services/Docky.Services/SystemService.cs, I changed:

[Interface(UPowerName)]
interface IUPower : org.freedesktop.DBus.Properties

to

[Interface("org.freedesktop.DBus.Properties")]
interface IUPower : org.freedesktop.DBus.Properties

I'm not a .NET programmer (Java), but I would hazard a guess that the proxy object that dbus-sharp is generating will only respond to the interface described by the Interface attribute. The 'Get' method is a part of org.freedesktop.DBus.Properties D-Bus interface, not org.freedesktop.UPower.

The other thing I did was to add a try/catch block around the code in HandleUPowerChanged() similar to the one in InitializeBattery(), so that even if the the D-Bus call fails, it doesn't crash all of Docky.
UQUOTE