[RLlib] Error importing the library

[mrz1999]

What happened + What you expected to happen

I try to import ray.rllib but it appears the following attribute error: 'NoneType' object has no attribute 'fs'.
This is the entire error message:

1 import ray.rllib

~/Desktop/prove_ma_alg/multiagent/venv_env/lib/python3.8/site-packages/ray/rllib/init.py in
8 from ray.rllib.env.external_env import ExternalEnv
9 from ray.rllib.env.multi_agent_env import MultiAgentEnv
---> 10 from ray.rllib.env.vector_env import VectorEnv
11 from ray.rllib.evaluation.rollout_worker import RolloutWorker
12 from ray.rllib.policy.policy import Policy

~/Desktop/prove_ma_alg/multiagent/venv_env/lib/python3.8/site-packages/ray/rllib/env/init.py in
4 from ray.rllib.env.external_multi_agent_env import ExternalMultiAgentEnv
5 from ray.rllib.env.multi_agent_env import MultiAgentEnv
----> 6 from ray.rllib.env.policy_client import PolicyClient
7 from ray.rllib.env.policy_server_input import PolicyServerInput
8 from ray.rllib.env.remote_base_env import RemoteBaseEnv

~/Desktop/prove_ma_alg/multiagent/venv_env/lib/python3.8/site-packages/ray/rllib/env/policy_client.py in
15 from ray.rllib.env.external_multi_agent_env import ExternalMultiAgentEnv
16 from ray.rllib.env.multi_agent_env import MultiAgentEnv
---> 17 from ray.rllib.policy.sample_batch import MultiAgentBatch
18 from ray.rllib.utils.annotations import PublicAPI
19 from ray.rllib.utils.typing import (
...
--> 142 _cached_fs: Dict[tuple, Tuple[float, pyarrow.fs.FileSystem]] = {}
143
144

AttributeError: 'NoneType' object has no attribute 'fs'

Versions / Dependencies

python==3.8.18
ray==2.6.3
gymnasium==0.26.3

Reproduction script

import ray.rllib

Issue Severity

High: It blocks me from completing my task.

[ArturNiederfahrenhorst]

What happens if you do a pip install pyarrow?

[mrz1999]

It is already installed

[sven1977]

I think your installation is broken. Can you try the following?

• In your conda or other env, do pip uninstall -y ray
• Erase the ray directory (should it still exist after above uninstall).
• Clone a fresh ray source from github into some directory.
• pip install -U [latest ray wheel for your platform]
• In the cloned git dir, run: cd ray; python python/ray/setup-dev.py and enter Y only for RLlib, then CTRL+C terminate the script

Try your steps from above again.

[stale]

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[stale]

Hi again! The issue will be closed because there has been no more activity in the 14 days since the last message.

Please feel free to reopen or open a new issue if you'd still like it to be addressed.

Again, you can always ask for help on our discussion forum or Ray's public slack channel.

Thanks again for opening the issue!