Attribute Error while importing gym_carlo

[AmmaraRazzaq]

In homework3 when I try to run "python play.py --scenario intersection" I get the following error

Traceback (most recent call last):
File "/home/ammara/imitation_learning/CS237B_HW3/play.py", line 3, in
import gym_carlo
File "/home/ammara/imitation_learning/CS237B_HW3/gym_carlo/init.py", line 6, in
if env_name in gym.envs.registry.env_specs:
AttributeError: 'dict' object has no attribute 'env_specs'