thanks for confirming!
frankly, i am stumped on this one; hopefully we can get the mods/devs to provide some additional insight. for now, i would suggest working with the model you’ve downloaded from the official site since all the parts are accounted for, so you can still proceed with your work.
Thank you for your help! For now, I’ll use the model downloaded from the official website, and I hope this issue will be fixed in the future.
Hi @howar845 Sorry to get back to you late. It is possible that your local cache files are corrupted so they cannot load properly. You can try to delete the local cache files and download the asset again.
I used the Isaac Sim App Selector to clear the caches. Then, I followed the steps: Content > Isaac Sim > Robots > NVIDIA > NovaCarter > nova_carter.usd. Whether I tried to drag and drop the file into the scene or open it, it still failed.
2025-09-25T05:48:51Z [41,279ms] [Error] [asyncio] Task exception was never retrieved
future: <Task finished name='Task-216' coro=<ExtendedFileInfo._build_ui_async() done, defined at /home/lab710/isaacsim/exts/isaacsim.gui.content_browser/isaacsim/gui/content_browser/impl/detail_view.py:79> exception=ErrorException(Error in 'operator()' at line 2549 in file /builds/omniverse/usd-ci/USD/pxr/usd/pcp/primIndex.cpp : 'Failed verification: ' arcNum < srcInfo.size() '')>
Traceback (most recent call last):
File "/home/lab710/isaacsim/exts/isaacsim.gui.content_browser/isaacsim/gui/content_browser/impl/detail_view.py", line 105, in _build_ui_async
stage = Usd.Stage.Open(self._current_url, load=Usd.Stage.LoadNone)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pxr.Tf.ErrorException:
Error in 'operator()' at line 2549 in file /builds/omniverse/usd-ci/USD/pxr/usd/pcp/primIndex.cpp : 'Failed verification: ' arcNum < srcInfo.size() ''
2025-09-25T05:49:02Z [53,156ms] [Warning] [omni.usd] Warning: in _ReportErrors at line 3172 of /builds/omniverse/usd-ci/USD/pxr/usd/usd/stage.cpp -- Could not load sublayer @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/Variants/nova_carter_sim_optimized.usd@ of layer @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/Variants/Configuration/nova_carter_merged_no_internals.usd@; skipping. (instantiating stage on stage @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/nova_carter.usd@ <0x5e1bdbf948a0>)
2025-09-25T05:49:02Z [53,156ms] [Warning] [omni.usd] Warning: in _ReportErrors at line 3172 of /builds/omniverse/usd-ci/USD/pxr/usd/usd/stage.cpp -- In </nova_carter>: Unresolved reference prim path @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/Variants/Configuration/nova_carter_merged_no_internals.usd@</nova_carter> introduced by @<expired>@</nova_carter> (instantiating stage on stage @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/nova_carter.usd@ <0x5e1bdbf948a0>)
2025-09-25T05:49:02Z [53,158ms] [Error] [omni.kit.undo.undo] Failed to undo a command: CreatePayloadCommand.
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/raycast.py", line 40, in rtx_query_complete
on_complete_fn(prim_path, world_space_pos, *args, **kwargs)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/handler.py", line 186, in <lambda>
on_complete_fn=lambda *args: self.__query_complete(is_drop, *args),
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/handler.py", line 151, in __query_complete
instance.dropped(drop_data)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/usd_file_drop_delegate.py", line 151, in dropped
usd_prim_path = self.add_usd_drop_marker(drop_data, self.__world_space_pos)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/usd_file_drop_delegate.py", line 178, in add_usd_drop_marker
new_prim_path, edit_context, relative_url = self.add_reference_to_stage(usd_context, stage, url) # noqa PLW0612
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/scene_drop_delegate.py", line 180, in add_reference_to_stage
omni.kit.commands.execute(cmd_name, usd_context=usd_context, path_to=new_prim_path, asset_path=url, instanceable=instanceable)
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/commands/command.py", line 463, in execute
result = omni.kit.undo.execute(command, name, kwargs)
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/undo/undo.py", line 78, in execute
result = _execute(command, name, level, history_key)
[...skipped...]
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/undo/undo.py", line 434, in _execute
last_entry.command.undo()
File "/home/lab710/isaacsim/extscache/omni.usd-1.13.10+8131b85d.lx64.r.cp311/omni/usd/commands/usd_commands.py", line 5528, in undo
prim_to.GetPayloads().ClearPayloads()
^^^^^^^^^^^^^^^^^^^
<class 'RuntimeError'> Accessed invalid null prim
2025-09-25T05:49:02Z [53,158ms] [Error] [omni.kit.commands.command] Failed to execute a command: CreatePayloadCommand.
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/raycast.py", line 40, in rtx_query_complete
on_complete_fn(prim_path, world_space_pos, *args, **kwargs)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/handler.py", line 186, in <lambda>
on_complete_fn=lambda *args: self.__query_complete(is_drop, *args),
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/handler.py", line 151, in __query_complete
instance.dropped(drop_data)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/usd_file_drop_delegate.py", line 151, in dropped
usd_prim_path = self.add_usd_drop_marker(drop_data, self.__world_space_pos)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/usd_file_drop_delegate.py", line 178, in add_usd_drop_marker
new_prim_path, edit_context, relative_url = self.add_reference_to_stage(usd_context, stage, url) # noqa PLW0612
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/scene_drop_delegate.py", line 180, in add_reference_to_stage
omni.kit.commands.execute(cmd_name, usd_context=usd_context, path_to=new_prim_path, asset_path=url, instanceable=instanceable)
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/commands/command.py", line 463, in execute
result = omni.kit.undo.execute(command, name, kwargs)
[...skipped...]
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/undo/undo.py", line 78, in execute
result = _execute(command, name, level, history_key)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/undo/undo.py", line 459, in _execute
raise error
File "/home/lab710/isaacsim/extscache/omni.kit.commands-1.4.10+8131b85d.lx64.r.cp311/omni/kit/undo/undo.py", line 420, in _execute
result = command.do()
^^^^^^^^^^^^
File "/home/lab710/isaacsim/extscache/omni.usd-1.13.10+8131b85d.lx64.r.cp311/omni/usd/commands/usd_commands.py", line 5458, in do
ref_stage = Usd.Stage.Open(asset_layer, anonymous_layer)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<class 'pxr.Tf.ErrorException'>
Error in 'operator()' at line 2549 in file /builds/omniverse/usd-ci/USD/pxr/usd/pcp/primIndex.cpp : 'Failed verification: ' arcNum < srcInfo.size() ''
2025-09-25T05:49:02Z [53,159ms] [Error] [omni.usd.commands.usd_commands] Invalid prim path to transform
2025-09-25T05:49:02Z [53,159ms] [Error] [omni.kit.viewport.window.dragdrop.handler] Traceback:
Traceback (most recent call last):
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/handler.py", line 151, in __query_complete
instance.dropped(drop_data)
File "/home/lab710/isaacsim/extscache/omni.kit.viewport.window-107.0.12+8131b85d/omni/kit/viewport/window/dragdrop/usd_file_drop_delegate.py", line 153, in dropped
omni.kit.commands.create('TransformPrimSRTCommand', path=usd_prim_path, new_translation=self.__world_space_pos).do()
File "/home/lab710/isaacsim/extscache/omni.usd-1.13.10+8131b85d.lx64.r.cp311/omni/usd/commands/usd_commands.py", line 2791, in do
self._set_transform_srt(
File "/home/lab710/isaacsim/kit/kernel/py/carb/profiler/__init__.py", line 99, in wrapper
r = f(*args, **kwds)
^^^^^^^^^^^^^^^^
File "/home/lab710/isaacsim/extscache/omni.usd-1.13.10+8131b85d.lx64.r.cp311/omni/usd/commands/usd_commands.py", line 2489, in _set_transform_srt
scale = Gf.Vec3d(scale_in)
^^^^^^^^^^^^^^^^^^
Boost.Python.ArgumentError: Python argument types in
Vec3d.__init__(Vec3d, NoneType)
did not match C++ signature:
__init__(_object*, double, double, double)
__init__(_object*, double)
__init__(_object*, pxrInternal_v0_24__pxrReserved__::GfVec3d)
__init__(_object*, pxrInternal_v0_24__pxrReserved__::GfVec3i)
__init__(_object*, pxrInternal_v0_24__pxrReserved__::GfVec3h)
__init__(_object*, pxrInternal_v0_24__pxrReserved__::GfVec3f)
__init__(boost::python::api::object)
2025-09-25T05:49:22Z [73,019ms] [Warning] [omni.usd] Coding Error (secondary thread): in operator() at line 2549 of /builds/omniverse/usd-ci/USD/pxr/usd/pcp/primIndex.cpp -- Failed verification: ' arcNum < srcInfo.size() '
2025-09-25T05:49:22Z [73,019ms] [Warning] [omni.usd] Warning (secondary thread): in _ReportErrors at line 3172 of /builds/omniverse/usd-ci/USD/pxr/usd/usd/stage.cpp -- Could not load sublayer @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/Variants/nova_carter_sim_optimized.usd@ of layer @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/Variants/Configuration/nova_carter_merged_no_internals.usd@; skipping. (instantiating stage on stage @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/nova_carter.usd@ <0x7f9f44054360>)
2025-09-25T05:49:22Z [73,019ms] [Warning] [omni.usd] Warning (secondary thread): in _ReportErrors at line 3172 of /builds/omniverse/usd-ci/USD/pxr/usd/usd/stage.cpp -- In </nova_carter>: Unresolved reference prim path @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/Variants/Configuration/nova_carter_merged_no_internals.usd@</nova_carter> introduced by @<expired>@</nova_carter> (instantiating stage on stage @https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/5.0/Isaac/Robots/NVIDIA/NovaCarter/nova_carter.usd@ <0x7f9f44054360>)
2025-09-25T05:49:22Z [73,051ms] [Warning] [omni.usd-abi.plugin] Detected deprecated setting 'rtx:post:backgroundZeroAlpha:backgroundDefaultColor' in file, converted to new settings, please save the file to keep the change.
@howar845 Could you please try Isaac Sim 5.1.0 OSS we recently released on github and see if you observe the same issue?
Also after you cleared the cache via Isaac Sim App Selector, did you check the hub folder? In Isaac Sim, cached USD assets are managed by the Omniverse Nucleus service, specifically through the “Hub” feature, and are stored locally on your machine. You can configure and find its location by checking the “CACHE” icon in the top-right corner of the application.
Thanks for the tip! I followed your suggestion—cleared the cache via the Isaac Sim App Selector and checked the Hub. That did the trick! The issue is resolved now. Really appreciate your help!