Can't run basic README tutorial

[khalld]

Hi everyone, I'm not able to run the provided example given on README. I tested with three versions of python, respectively 3.6.15, 3.7.13 , 3.11.1. I'm not able to use 3.6.0 because is not supported for Mac OS 11+ (https://github.com/pyenv/pyenv/issues/2685#event-9052270090) . I receive an AssertionError:

After setup of rov2 and after pip install -e i try to run python train.py --policy sarl. For all version the error is the same:

/Users/danilo/GitHub/materiale-tesi/venv3615/lib/python3.6/site-packages/gym/core.py:27: UserWarning: WARN: Gym minimally supports python 3.6 as the python foundation not longer supports the version, please update your version to 3.7+
  "Gym minimally supports python 3.6 as the python foundation not longer supports the version, please update your version to 3.7+"
Output directory already exists! Overwrite the folder? (y/n)y
2023-04-21 16:47:38, INFO: Current git head hash code: %s
2023-04-21 16:47:38, INFO: Using device: cpu
2023-04-21 16:47:38, INFO: Policy: SARL w/ global state
Traceback (most recent call last):
  File "train.py", line 177, in <module>
    main()
  File "train.py", line 76, in main
    env = gym.make('CrowdSim-v0')
  File "/Users/danilo/GitHub/materiale-tesi/venv3615/lib/python3.6/site-packages/gym/envs/registration.py", line 669, in make
    env = PassiveEnvChecker(env)
  File "/Users/danilo/GitHub/materiale-tesi/venv3615/lib/python3.6/site-packages/gym/wrappers/env_checker.py", line 22, in __init__
    ), "The environment must specify an action space. https://www.gymlibrary.dev/content/environment_creation/"
AssertionError: The environment must specify an action space. https://www.gymlibrary.dev/content/environment_creation/

Anyone could help ?

[khalld]

The above issue is caused by an upgraded version of gym library. Works correctly with version 0.18.0, just downgrade it. Maybe could works also with Python > 3.6.15, anyone could confirm ?

[xiang2020git]

The sollution works in ubuntu 20.04 with python 3.8.10. Thanks!