n_rows = 5
n_columns = 5
num_cars_left = 50
num_cars_right = 50
num_cars_top = 50
num_cars_bot = 50

Loading configuration... done.
Success.
Loading configuration... done.
Traceback (most recent call last):
  File "examples/sumo/grid.py", line 237, in <module>
    exp.run(1, 1500)
  File "/home/dnl/flow/flow/core/experiment.py", line 118, in run
    state = self.env.reset()
  File "/home/dnl/flow/flow/envs/loop/loop_accel.py", line 167, in reset
    obs = super().reset()
  File "/home/dnl/flow/flow/envs/base_env.py", line 520, in reset
    raise FatalFlowError(msg=msg)
flow.utils.exceptions.FatalFlowError:
Not enough vehicles have spawned! Bad start?
Missing vehicles / initial state:
- human_994: ('human', 'bot4_0', 0, 446, 0)
- human_546: ('human', 'top0_5', 0, 466, 0)
- human_886: ('human', 'bot3_0', 0, 366, 0)
- human_689: ('human', 'bot1_0', 0, 396, 0)
.....

# check to make sure all vehicles have been spawned
        if len(self.initial_ids) > len(initial_ids):
            missing_vehicles = list(set(self.initial_ids) - set(initial_ids))
            msg = 'nNot enough vehicles have spawned! Bad start?n'
                  'Missing vehicles / initial state:n'
            for veh_id in missing_vehicles:
                msg += '- {}: {}n'.format(veh_id, self.initial_state[veh_id])
            raise FatalFlowError(msg=msg)