Comment 30 for bug 331192

Iv'e seen it too on lucid
The error message looks like this:

systemsettings(22845)/kutils (KCModuleProxy) KCModuleProxyPrivate::loadModule: Module not already loaded, loading module "Printer Configuration" from library "kpythonpluginfactory" using symbol "kpythonpluginfactory"
systemsettings(22845)/python (plugin) KPythonPluginFactory::KPythonPluginFactory: KPythonPluginFactory::KPythonPluginFactory()
systemsettings(22845)/python (plugin) KPythonPluginFactory::initialize: Initializing Python interpreter.
systemsettings(22845)/python (plugin) KPythonPluginFactory::initialize: Succesfully initialized Python interpreter.
systemsettings(22845)/python (plugin) KPythonPluginFactory::create: KPythonPluginFactory::create iface: KCModule
systemsettings(22845)/python (plugin) KPythonPluginFactory::create: keyword to be used for finding the plugin code: "system-config-printer-kde/system-config-printer-kde.py"
systemsettings(22845)/python (plugin) KPythonPluginFactory::create: Path to plugin code is: "/usr/share/kde4/apps/system-config-printer-kde/system-config-printer-kde.py"
systemsettings(22845)/python (plugin): Error while running factory function for Python plugin: "system-config-printer-kde/system-config-printer-kde.py"
Traceback (most recent call last):
  File "<string>", line 18, in kpythonpluginfactory_bridge
  File "/usr/share/kde4/apps/system-config-printer-kde/system-config-printer-kde.py", line 4004, in CreatePlugin
    kcm = u.makeui(component_data, widget_parent)
  File "/usr/share/kde4/apps/system-config-printer-kde/system-config-printer-kde.py", line 217, in makeui
    self.ui.btnJOResetCopies),
  File "/usr/share/kde4/apps/system-config-printer-kde/options.py", line 117, in __init__
    self.reinit (None)
  File "/usr/share/kde4/apps/system-config-printer-kde/options.py", line 155, in reinit
    self.set_widget_value (self.system_default)
  File "/usr/share/kde4/apps/system-config-printer-kde/options.py", line 178, in set_widget_value
    raise NotImplemented
TypeError: exceptions must be classes or instances, not NotImplementedType
systemsettings(22845)/python (plugin) KPythonPluginFactory::create: KPythonPluginFactory::create iface: KCModule
systemsettings(22845)/python (plugin) KPythonPluginFactory::create: keyword to be used for finding the plugin code: ""
systemsettings(22845)/python (plugin) KPythonPluginFactory::create: Path to plugin code is: "/home/yann/.kde/share/apps/"
systemsettings(22845)/python (plugin): Failed to import module
systemsettings(22845)/kcontrol KCModuleLoader::loadModule: This module has no valid entry symbol at all. The reason could be that it's still using K_EXPORT_COMPONENT_FACTORY with a custom X-KDE-FactoryName which is not supported anymore