TypeError : tuple indices must be integers or slices, not tuple

when i run /Paper Trading/Automated_Paper_Trading.ipynb

train(start_date = '2022-08-30',
end_date = '2022-09-08',
ticker_list = ticker_list,
data_source = 'alpaca',
time_interval= '1Min',
technical_indicator_list= INDICATORS,
drl_lib='elegantrl',
env=env,
model_name='ppo',
API_KEY = API_KEY,
API_SECRET = API_SECRET,
API_BASE_URL = API_BASE_URL,
erl_params=ERL_PARAMS,
cwd='./papertrading_erl', #current_working_dir
break_step=2e5)

i got an error, TypeError: tuple indices must be integers or slices, not tuple, it seems happen in
agent.states = env.reset()[np.newaxis, :]
i want to know why