exception for thread

[mhamzaaziz1]

when i start the thread it show this exception

Exception in thread Thread-31:
Traceback (most recent call last):
File "/home/anderson/.conda/envs/tensorflow/lib/python3.6/threading.py", line 916, in _bootstrap_inner
self.run()
File "/home/anderson/.conda/envs/tensorflow/lib/python3.6/threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "", line 141, in actorLearner
x_t1_col, r_t, terminal, info = env.step(KEYMAP[GAME][action_index])
File "/home/anderson/Videos/gym/gym/wrappers/time_limit.py", line 31, in step
observation, reward, done, info = self.env.step(action)
File "/home/anderson/Videos/gym/gym/envs/atari/atari_env.py", line 68, in step
action = self._action_set[a]
IndexError: index 5 is out of bounds for axis 0 with size 4