I met some problems with compiler_gym.bin.service, and I couldn't start a compiler_gym shell

[Rain0802]

$ python -m compiler_gym.bin.service --ls_env this command could be run
but when I run this command python -m compiler_gym.bin.service --env=llvm-v0, such errors are reported, and I couldn't enter a compiler_gym shell.

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/home/rain/anaconda3/lib/python3.11/site-packages/compiler_gym/bin/service.py", line 240, in <module>
    app.run(main)
  File "/home/rain/anaconda3/lib/python3.11/site-packages/absl/app.py", line 308, in run
    _run_main(main, args)
  File "/home/rain/anaconda3/lib/python3.11/site-packages/absl/app.py", line 254, in _run_main
    sys.exit(main(argv))
             ^^^^^^^^^^
  File "/home/rain/anaconda3/lib/python3.11/site-packages/compiler_gym/bin/service.py", line 232, in main
    env = env_from_flags()
          ^^^^^^^^^^^^^^^^
  File "/home/rain/anaconda3/lib/python3.11/site-packages/compiler_gym/util/flags/env_from_flags.py", line 115, in env_from_flags
    env = gym.make(
          ^^^^^^^^^
  File "/home/rain/anaconda3/lib/python3.11/site-packages/gym/envs/registration.py", line 669, in make
    env = PassiveEnvChecker(env)
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/rain/anaconda3/lib/python3.11/site-packages/gym/wrappers/env_checker.py", line 27, in __init__
    check_observation_space(env.observation_space)
  File "/home/rain/anaconda3/lib/python3.11/site-packages/gym/utils/passive_env_checker.py", line 74, in check_space
    raise AssertionError(
AssertionError: observation space does not inherit from `gym.spaces.Space`, actual type: <class 'NoneType'>