How to use the evasdk.robot_state.RobotState.ERROR function in evasdk

def control_wait_for(self, goal, interval_sec=1):
        """
        control_wait_for will poll Eva's state, waiting for Eva to reach the goal state
        """
        parsed_goal = RobotState(goal)

        while True:
            robot_state = RobotState(self.data_snapshot()['control']['state'])

            if robot_state == RobotState.ERROR:
                eva_error('Eva is in error control state')
            elif robot_state == parsed_goal:
                return

            time.sleep(interval_sec)