Report wrongly-typed settings and abort, as originally planned.

                % (self.SETTINGS_MODULE, e)

            )

        tuple_settings = ("INSTALLED_APPS", "TEMPLATE_DIRS")

        for setting in dir(mod):

            if setting == setting.upper():

                setting_value = getattr(mod, setting)

                if setting in tuple_settings and \

                        isinstance(setting_value, six.string_types):

                    raise ImproperlyConfigured("The %s setting must be a tuple. "

                            "Please fix your settings." % setting)

                setattr(self, setting, setting_value)

        if not self.SECRET_KEY: