def _initInversionFramework(self, **kwargs):
        """Initialize or re-initialize the inversion framework.

        Called once in the constructor to force the manager to create the
        necessary Framework instance.
        """
        self._fw = self.createInversionFramework(**kwargs)

        if self.fw is None:
            pg.critical("createInversionFramework does not return "
                        "valid inversion framework.")