getting error when Importing the environment

[Tareq-Diab]

after installing i get an error when trying to import AirHockey-v0

import gym
env = gym.make('AirHockey-v0')

the Output :

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/tareq/.local/lib/python3.6/site-packages/gym/envs/registration.py", line 569, in make
    _check_version_exists(ns, name, version)
  File "/home/tareq/.local/lib/python3.6/site-packages/gym/envs/registration.py", line 219, in _check_version_exists
    _check_name_exists(ns, name)
  File "/home/tareq/.local/lib/python3.6/site-packages/gym/envs/registration.py", line 198, in _check_name_exists
    f"Environment {name} doesn't exist{namespace_msg}. {suggestion_msg}"
gym.error.NameNotFound: Environment AirHockey doesn't exist.