RoboParty Fails to load

I am following the guides for Isaac Sim (Omniverse) and the Workflow tutorial that asks you to load the roboparty does nothing.

Console Output:

2021-11-23 18:29:56  [Error] [asyncio] [/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/kit/python/lib/python3.7/asyncio/] Task exception was never retrieved
future: <Task finished coro=<BaseSampleExtension._on_load_world.<locals>._on_load_world_async() done, defined at /home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.examples/omni/isaac/examples/base_sample/> exception=ArgumentError('Python argument types in\n    None.GetPrimAtPath(Stage, NoneType)\ndid not match C++ signature:\n    GetPrimAtPath(pxrInternal_v0_20__pxrReserved__::UsdStage {lvalue}, pxrInternal_v0_20__pxrReserved__::SdfPath path)')>
Traceback (most recent call last):
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.examples/omni/isaac/examples/base_sample/", line 162, in _on_load_world_async
    await self._sample.load_world_async()
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.examples/omni/isaac/examples/base_sample/", line 48, in load_world_async
    await self._world.reset_async()
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/world/", line 196, in reset_async
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/tasks/", line 66, in set_up_scene
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/scenes/", line 162, in add_default_ground_plane
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/objects/", line 77, in __init__
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/prims/", line 57, in __init__
    prim = get_prim_at_path(prim_path)
  File "/home/coach/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/utils/", line 28, in get_prim_at_path
    return get_current_stage().GetPrimAtPath(prim_path)
Boost.Python.ArgumentError: Python argument types in
    None.GetPrimAtPath(Stage, NoneType)
did not match C++ signature:
    GetPrimAtPath(pxrInternal_v0_20__pxrReserved__::UsdStage {lvalue}, pxrInternal_v0_20__pxrReserved__::SdfPath path)

Basically almost everything is failing to load from the examples. I can’t be the only sucker experiencing this. Right? I so rapidly loosing faith in NVIDIA.

Can you please make sure that the /Isaac folder is available on your localhost installed nucleus server?

If none of the examples are working you might not have the assets installed correctly.

I literally did that and the omniverse see’s that its okay during the check.

Did you have a /Isaac folder from a previous version of isaac sim, or did you download a clean copy after installing 2021.2.0?

I believe it’s clean as I just completed the steps today.

Can I simply create a clean /Isaac folder and paste the assets zip folder in?

If you open the following file:

Does it load?

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Alternatively you can delete your /Isaac folder from the localhost nucleus and add the read only mount version:


The Isaac folder is empty. Removed the /Isaac folder and hit the download assets button but nothing seems to be happening.

Can you go to:
Stop cache and then try downloading?

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It’s downloading. Will report back once completed.

Thanks @clayton.allen.ks, your help in debugging this is extremely appreciated.
We’re seeing some issues with cache interfering with the initial download and looking into a way to fix as soon as possible.

The mount alternative:

is another potential option to workaround this issue.

Success! The demos are working now. I will resume going through the docs to learn how to utilize the Isaac Sim with my Docker running the SDK now.


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