Why firstaidkit-engine get crashed with error "No option flow in section: operation"

Issue

• firstaidkit-engine get crashed with following error

# firstaidkit -g gtk

:configuration.py:112:__getattr__:NoOptionError: No option 'flow' in section: 'operation'
:
:Traceback (most recent call last):
:  File "/usr/share/firstaidkit/frontend/frontend_gtk.py", line 72, in worker
:    self._tasker.run()
:  File "/usr/lib/python2.6/site-packages/pyfirstaidkit/interpret.py", line 197, in run
:    flows = len(pluginlist)*[self._config.operation.flow]
:  File "/usr/lib/python2.6/site-packages/pyfirstaidkit/configuration.py", line 112, in __getattr__
:    NoOptionError(key, self.__dict__["__section_name"])
:NoOptionError: No option 'flow' in section: 'operation'