Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/defer.py", line 428, in defer
    result = func(*args, **kwargs)
  File "/usr/lib/pymodules/python2.6/sessioninstaller/core.py", line 1024, in InstallPrinterDrivers
    return self._install_printer_drivers_resources(xid, resources,
AttributeError: 'SessionInstaller' object has no attribute '_install_printer_drivers_resources'