Example errors of IsaacSim 2021.2 ver

Hi.

I am trying to apply RMPflow to my robot using new version of IsaacSim(2021.2).

First, I wanna check the related example, ‘Isaac Examples/Manipulation/Follow Target’, but I cannot open the file with this error when I click ‘World Controls/Load’.

2021-12-08 09:36:54 [Error] [asyncio] [/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/kit/python/lib/python3.7/asyncio/base_events.py:1619] Task exception was never retrieved
future: <Task finished coro=<BaseSampleExtension.on_load_world..on_load_world_async() done, defined at /home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.examples/omni/isaac/examples/base_sample/base_sample_extension.py:161> 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/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.examples/omni/isaac/examples/base_sample/base_sample_extension.py”, line 162, in on_load_world_async
await self.sample.load_world_async()
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.examples/omni/isaac/examples/base_sample/base_sample.py”, line 48, in load_world_async
await self.world.reset_async()
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/world/world.py”, line 196, in reset_async
task.set_up_scene(self.scene)
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/tasks/stacking.py”, line 66, in set_up_scene
scene.add_default_ground_plane()
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/scenes/scene.py”, line 162, in add_default_ground_plane
restitution=restitution,
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/objects/ground_plane.py”, line 77, in init
collision=True,
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/prims/geometry_prim.py”, line 57, in init
prim = get_prim_at_path(prim_path)
File “/home/idim/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/omni.isaac.core/omni/isaac/core/utils/prims.py”, 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)

I didn’t change any files or codes, and do not know what it doesn’t work.

What can I do ?

Thank you.

@swimpark can you try opening the following file?
omniverse://localhost/Isaac/Environments/Grid/default_environment.usd

If this doesn’t exist I would recommend deleting the /Isaac folder on your localhost nucleus server and then following this to download the assets again.
https://docs.omniverse.nvidia.com/app_isaacsim/app_isaacsim/install_basic.html#isaac-sim-first-run