[Bug Report] Error when running RSL RL Framework

[LuckyCZD]

When running any training scripts on the RSL RL Framework, such as the one from the installation guide
python scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0 --headless
it errors

[INFO]: Parsing configuration from: isaaclab_tasks.manager_based.classic.ant.ant_env_cfg:AntEnvCfg
[INFO]: Parsing configuration from: isaaclab_tasks.manager_based.classic.ant.agents.rsl_rl_ppo_cfg:AntPPORunnerCfg
[INFO] Logging experiment in directory: D:\IsaacLab\logs\rsl_rl\ant
Exact experiment name requested from command line: 2025-05-17_11-09-37
Setting seed: 42
[INFO]: Base environment:
        Environment device    : cuda:0
        Environment seed      : 42
        Physics step-size     : 0.008333333333333333
        Rendering step-size   : 0.016666666666666666
        Environment step-size : 0.016666666666666666
2025-05-17 03:12:15 [164,505ms] [Warning] [omni.usd] Warning: in _ReportErrors at line 2890 of C:\g\122538378\USD\pxr\usd\usd\stage.cpp -- In </World/ground/terrain>: Could not open asset @http://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/4.5/Isaac/Environments/Grid/default_environment.usd@ for reference introduced by @anon:000001F98D148FE0:World0.usd@</World/ground/terrain>. (recomposing stage on stage @anon:000001F98D148FE0:World0.usd@ <000001F98D6EA550>)

[INFO]: Time taken for scene creation : 158.007192 seconds
Error executing job with overrides: []
Traceback (most recent call last):
  File "d:/isaaclab/source/isaaclab_tasks/isaaclab_tasks/utils/hydra.py", line 101, in hydra_main
    func(env_cfg, agent_cfg, *args, **kwargs)
  File "D:\IsaacLab\scripts\reinforcement_learning\rsl_rl\train.py", line 141, in main
    env = gym.make(args_cli.task, cfg=env_cfg, render_mode="rgb_array" if args_cli.video else None)
  File "C:\Users\User\.conda\envs\isaac\lib\site-packages\gymnasium\envs\registration.py", line 742, in make
    env = env_creator(**env_spec_kwargs)
  File "d:/isaaclab/source/isaaclab/isaaclab/envs/manager_based_rl_env.py", line 79, in __init__
    super().__init__(cfg=cfg)
  File "d:/isaaclab/source/isaaclab/isaaclab/envs/manager_based_env.py", line 130, in __init__
    self.scene = InteractiveScene(self.cfg.scene)
  File "d:/isaaclab/source/isaaclab/isaaclab/scene/interactive_scene.py", line 151, in __init__
    self._add_entities_from_cfg()
  File "d:/isaaclab/source/isaaclab/isaaclab/scene/interactive_scene.py", line 648, in _add_entities_from_cfg
    self._terrain = asset_cfg.class_type(asset_cfg)
  File "d:/isaaclab/source/isaaclab/isaaclab/terrains/terrain_importer.py", line 103, in __init__
    self.import_ground_plane("terrain")
  File "d:/isaaclab/source/isaaclab/isaaclab/terrains/terrain_importer.py", line 217, in import_ground_plane
    ground_plane_cfg.func(prim_path, ground_plane_cfg)
  File "d:/isaaclab/source/isaaclab/isaaclab/sim/spawners/from_files/from_files.py", line 145, in spawn_ground_plane
    collision_prim_path = prim_utils.get_prim_path(
  File "c:/users/user/.conda/envs/isaac/lib/site-packages/isaacsim/exts/isaacsim.core.utils/isaacsim/core/utils/prims.py", line 611, in get_prim_path
    return prim.GetPath()
AttributeError: 'NoneType' object has no attribute 'GetPath'

Set the environment variable HYDRA_FULL_ERROR=1 for a complete stack trace.
2025-05-17 03:12:16 [164,774ms] [Warning] [omni.fabric.plugin] gFabricState->gUsdStageToSimStageWithHistoryMap had 1 outstanding SimStageWithHistory(s) at shutdown
2025-05-17 03:12:16 [164,864ms] [Warning] [carb] Recursive unloadAllPlugins() detected!

Steps to reproduce

Following the pip installation onhttps://isaac-sim.github.io/IsaacLab/main/source/setup/installation/pip_installation.html

testisaaclab.bat -p scripts\tutorials\00_sim\create_empty.py, seems everything right, but when test python scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0 --headless, it errors.
Also when testisaaclab.bat -p scripts\demos\hands.py, it errors

[13.484s] Simulation App Startup Complete
[13.545s] [ext: omni.physx.fabric-106.5.7] startup
2025-05-17 03:20:29 [127,207ms] [Warning] [omni.usd] Warning: in _ReportErrors at line 2890 of C:\g\122538378\USD\pxr\usd\usd\stage.cpp -- In </World/defaultGroundPlane>: Could not open asset @http://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/4.5/Isaac/Environments/Grid/default_environment.usd@ for reference introduced by @anon:0000022C853910F0:World0.usd@</World/defaultGroundPlane>. (recomposing stage on stage @anon:0000022C853910F0:World0.usd@ <0000022C81EE4430>)

Traceback (most recent call last):
  File "D:\IsaacLab\scripts\demos\hands.py", line 165, in <module>
    main()
  File "D:\IsaacLab\scripts\demos\hands.py", line 153, in main
    scene_entities, scene_origins = design_scene()
  File "D:\IsaacLab\scripts\demos\hands.py", line 69, in design_scene
    cfg.func("/World/defaultGroundPlane", cfg)
  File "d:/isaaclab/source/isaaclab/isaaclab/sim/spawners/from_files/from_files.py", line 145, in spawn_ground_plane
    collision_prim_path = prim_utils.get_prim_path(
  File "c:/users/user/.conda/envs/isaac/lib/site-packages/isaacsim/exts/isaacsim.core.utils/isaacsim/core/utils/prims.py", line 611, in get_prim_path
    return prim.GetPath()
AttributeError: 'NoneType' object has no attribute 'GetPath'

System Info

• Commit: 21f7136
• Isaac Sim Version: 4.5
• OS: windows 10
• GPU: RTX4080SUPER
• CUDA: 11.7
• GPU Driver: 572.60

Additional context

I also test on

• Commit: 21f7136
• Isaac Sim Version: 4.5
• OS: Ubuntu20.04
• GPU: RTX4080SUPER
• CUDA: 11.7
• GPU Driver: 550
  Everything is right. Is this version compatible with Windows?

Checklist

• I have checked that there is no similar issue in the repo (required)
• I have checked that the issue is not in running Isaac Sim itself and is related to the repo

[RandomOakForest]

Thanks for posting this. It seems not all the assets may have been downloaded upon install. Where you able to verify the installation as explained here? This was reported earlier. In this case, it is likely a clean reinstall would fix this.

[zz7379]

same problem

[hojae-io]

Same problem.
It seems this happens spontaneously. Sometime I can run, sometime it has this error (with exactly same code)

I guess the problem is not on the local code but on remote server? Like this part:

Could not open asset @http://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/4.5/Isaac/Environments/Grid/default_environment.usd@ for reference introduced by @anon:000001F98D148FE0:World0.usd@</World/ground/terrain>. (recomposing stage on stage @anon:000001F98D148FE0:World0.usd@ <000001F98D6EA550>)

[RandomOakForest]

Thank you for following up. I will close this issue for now. Let us know if you still face this problem.