<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def on_balancer_remove(self, name):
 """ The removal of a load balancer config isn't supported just yet. If the balancer being removed is the only configured one we fire a critical log message saying so. A writer setup with no balancers is less than useless. """

        if len(self.configurables[Balancer]) == 1:
            logger.critical(
                "'%s' config file removed! It was the only balancer left!",
                name
            )