Execute local call

def _local_call(self, call_conf):
        '''
        Execute local call
        '''
        try:
            ret = self._get_caller(call_conf).call()
        except SystemExit:
            ret = 'Data is not available at this moment'
            self.out.error(ret)
        except Exception as ex:
            ret = 'Unhandled exception occurred: {}'.format(ex)
            log.debug(ex, exc_info=True)
            self.out.error(ret)

        return ret