Posting the error:

Running docky --debug

< ...some other stuff... >

[Info  10:27:52.535] [Helper] Starting GnoMenu.py

[Info  10:27:52.560] [HelperService] Helper added: /usr/share/dockmanager/scripts/GnoMenu.py

[Info  10:27:52.757] [Helper] GnoMenu.py :: No module named dockmanager.dockmanager

[Info  10:27:52.758] [Helper] GnoMenu.py :: gconf backend

[Info  10:27:52.758] [Helper] GnoMenu.py :: 239

[Error 10:27:52.759] [Helper] GnoMenu.py :: Traceback (most recent call last):

[Error 10:27:52.759] [Helper] GnoMenu.py ::   File "/usr/share/dockmanager/scripts/GnoMenu.py", line 120, in < module >

[Error 10:27:52.759] [Helper] GnoMenu.py ::     class DockyGnoMenuItem(DockManagerItem):

[Error 10:27:52.759] [Helper] GnoMenu.py :: NameError: name 'DockManagerItem' is not defined

[Info  10:27:52.874] [Helper] GnoMenu.py has exited (Code 1).

After installing dockmanager

Now this is what happens:

[Info 11:34:36.166] [Helper] GnoMenu.py :: gconf backend

[Info 11:34:36.166] [Helper] GnoMenu.py :: 136

[Info 11:34:36.166] [Helper] GnoMenu.py :: DockManagerSink(): System.NotSupportedException: Cannot send null variant [Info 11:34:36.210]

[Helper] GnoMenu.py has exited (Code 0).

I tried to click the icon at the dock:

gconf backend 380

DockManagerSink(): System.NotSupportedException: Cannot send null variant

gconf backend 380

DockManagerSink(): System.NotSupportedException: Cannot send null variant

How can I fix this? Thanks for your prompt answer!