'NoneType' object has no attribute 'copy'

[sjtuzhaoxh]

C:\Users\zhaoxianghui\AppData\Local\Programs\Python\Python38\python.exe D:\project\python\tensor2tensor-master\tensor2tensor\bin\t2t-trainer --registry_help
Traceback (most recent call last):
File "D:\project\python\tensor2tensor-master\tensor2tensor\bin\t2t-trainer", line 23, in
from tensor2tensor.bin import t2t_trainer
File "D:\project\python\tensor2tensor-master\tensor2tensor\bin\t2t_trainer.py", line 24, in
from tensor2tensor import models # pylint: disable=unused-import
File "D:\project\python\tensor2tensor-master\tensor2tensor\models_init_.py", line 51, in
from tensor2tensor.models.research import rl
File "D:\project\python\tensor2tensor-master\tensor2tensor\models\research\rl.py", line 27, in
from tensor2tensor.envs import tic_tac_toe_env
File "D:\project\python\tensor2tensor-master\tensor2tensor\envs_init_.py", line 23, in
from tensor2tensor.envs import tic_tac_toe_env
File "D:\project\python\tensor2tensor-master\tensor2tensor\envs\tic_tac_toe_env.py", line 244, in
register()
File "D:\project\python\tensor2tensor-master\tensor2tensor\envs\tic_tac_toe_env.py", line 239, in register
unused_tictactoe_id, unused_tictactoe_env = gym_utils.register_gym_env(
File "D:\project\python\tensor2tensor-master\tensor2tensor\rl\gym_utils.py", line 360, in register_gym_env
return env_name, gym.make(env_name)
File "C:\Users\zhaoxianghui\AppData\Local\Programs\Python\Python38\lib\site-packages\gym\envs\registration.py", line 572, in make
kwargs = spec.kwargs.copy()
AttributeError: 'NoneType' object has no attribute 'copy'

[sjtuzhaoxh]

@TimOgden
Change kwargs=None optional parameter to **kwargs this works to me