[Bug Report] Error Verifying Isaac Lab installation: ModuleNotFoundError: No module named 'omni.kit.usd', Failed to resolve extension dependencies, Synced registries

[NoahSTEMStuff]

Describe the bug

I installed isaac sim via binaries, and isaac sim is able to run fine, however, when trying to run the python script under the
"Verifying the Isaac Lab installation" section I get an error with kit.

Steps to reproduce

./isaaclab.sh -p scripts/tutorials/00_sim/create_empty.py
[INFO] Using python from: /home/noah/IsaacLab/_isaac_sim/python.sh                                                                        
[WARN][AppLauncher]: There are no arguments attached to the ArgumentParser object. If you have your own arguments, please load your own arguments before calling the `AppLauncher.add_app_launcher_args` method. This allows the method to check the validity of the arguments and perform checks for argument names.
[INFO][AppLauncher]: Loading experience file: /home/noah/IsaacLab/apps/isaaclab.python.kit
Loading user config located at: '/home/noah/isaacsim/kit/data/Kit/Isaac-Sim/4.5/user.config.json'
[Info] [carb] Logging to file: /home/noah/isaacsim/kit/logs/Kit/Isaac-Sim/4.5/kit_20250225_010701.log
2025-02-25 09:07:01 [0ms] [Warning] [omni.kit.app.plugin] No crash reporter present, dumps uploading isn't available.
[0.043s] Failed to solve some dependencies locally, syncing with extension registry...
[0.046s] [ext: omni.kit.async_engine-0.0.1] startup
[0.050s] [ext: omni.client.lib-1.0.0] startup
[0.071s] [ext: omni.kit.registry.nucleus-0.0.0] startup
2025-02-25 09:07:02 [68ms] [Error] [omni.kit.registry.nucleus.index_v2.index_sync] Syncing registry index failed for url: 'https://ovextensionsprod.blob.core.windows.net/exts/kit/prod/106/shared/v2'. Exception: Traceback (most recent call last):
  File "/home/noah/isaacsim/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 116, in _task
    self._task_uncaught()
  File "/home/noah/isaacsim/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 136, in _task_uncaught
    self._registry_file = RegistryFile(self._local_path)
  File "/home/noah/isaacsim/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/registry_file.py", line 28, in __init__
    data = json.loads(f.read())
  File "/home/noah/IsaacLab/_isaac_sim/kit/python/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/home/noah/IsaacLab/_isaac_sim/kit/python/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/noah/IsaacLab/_isaac_sim/kit/python/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

2025-02-25 09:07:02 [69ms] [Error] [omni.kit.registry.nucleus.index_v2.index_sync] Syncing registry index failed for url: 'https://ovextensionsprod.blob.core.windows.net/exts/kit/prod/sdk/106.5/d02c707b/v2'. Exception: Traceback (most recent call last):
  File "/home/noah/isaacsim/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 116, in _task
    self._task_uncaught()
  File "/home/noah/isaacsim/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 136, in _task_uncaught
    self._registry_file = RegistryFile(self._local_path)
  File "/home/noah/isaacsim/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/registry_file.py", line 28, in __init__
    data = json.loads(f.read())
  File "/home/noah/IsaacLab/_isaac_sim/kit/python/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/home/noah/IsaacLab/_isaac_sim/kit/python/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/noah/IsaacLab/_isaac_sim/kit/python/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

2025-02-25 09:07:02 [489ms] [Error] [omni.ext.plugin] Failed to resolve extension dependencies. Failure hints:
	[isaaclab.python-2.0.1] dependency: 'omni.kit.menu.edit' = { version='^' } can't be satisfied. Available versions:
	 (none found)
 Synced registries:
	 - kit/default         : found 0 packages (couldn't connect or empty)
	 - kit/sdk             : found 0 packages (couldn't connect or empty)
	 - kit/community       : found 399 packages 

2025-02-25 09:07:02 [490ms] [Error] [omni.kit.app.plugin] Exiting app because of dependency solver failure...
Traceback (most recent call last):
  File "/home/noah/IsaacLab/scripts/tutorials/00_sim/create_empty.py", line 29, in <module>
    app_launcher = AppLauncher(args_cli)
  File "/home/noah/IsaacLab/source/isaaclab/isaaclab/app/app_launcher.py", line 114, in __init__
    self._create_app()
  File "/home/noah/IsaacLab/source/isaaclab/isaaclab/app/app_launcher.py", line 638, in _create_app
    self._app = SimulationApp(self._sim_app_config, experience=self._sim_experience_file)
  File "/home/noah/IsaacLab/_isaac_sim/exts/isaacsim.simulation_app/isaacsim/simulation_app/simulation_app.py", line 227, in __init__
    from .utils import create_new_stage, open_stage
  File "/home/noah/IsaacLab/_isaac_sim/exts/isaacsim.simulation_app/isaacsim/simulation_app/utils.py", line 17, in <module>
    from omni.kit.usd import layers
ModuleNotFoundError: No module named 'omni.kit.usd'
2025-02-25 09:07:02 [492ms] [Warning] [carb] Recursive unloadAllPlugins() detected!
There was an error running python

System Info

• Commit: f1a4975
• Isaac Sim Version: 4.5.0
• OS: Ubuntu 20.04
• GPU: NVIDIA RTX A4500
• CUDA: 12.3
• GPU Driver: 545.23.08
• I have 4 GPU's

Additional context

I also get a very similar issue when running the isaac sim compatibility checker Test kit button. I think I might have accidentally deleted a file. I was getting a different error when trying to install isaac sim, so I decided to delete a bunch of files I thought was related to the isaac sim installation, but afterwards I think I started getting synced registries error. Even though I have gone through the steps to install isaac sim, and then isaac lab I still get those errors.

Also isaac sim is able to be launched. But when I run the isaac sim compatibility checker and click test kit I get the following error. so something is wrong with kit, but none of the installation steps has helped fix it.

./omni.isaac.sim.compatibility_check.sh
Loading user config located at: '/home/noah/.local/share/ov/data/Kit/Isaac-Sim_Compatibility_Checker/4.5/user.config.json'
[Info] [carb] Logging to file: /home/noah/.nvidia-omniverse/logs/Kit/Isaac-Sim_Compatibility_Checker/4.5/kit_20250225_005824.log
[0.112s] [ext: omni.kit.async_engine-0.0.1] startup
[0.160s] [ext: omni.client.lib-1.0.0] startup
[0.184s] [ext: omni.stats-1.0.1] startup
[0.184s] [ext: omni.client-1.2.2] startup
[0.239s] [ext: omni.gpu_foundation.shadercache.vulkan-1.0.0] startup
[0.244s] [ext: omni.assets.plugins-0.0.0] startup
[0.245s] [ext: omni.gpu_foundation-0.0.0] startup
[0.251s] [ext: carb.windowing.plugins-1.0.0] startup
[0.260s] [ext: omni.kit.renderer.init-0.0.0] startup

|---------------------------------------------------------------------------------------------|
| Driver Version: 545.23.08     | Graphics API: Vulkan
|=============================================================================================|
| GPU | Name                             | Active | LDA | GPU Memory | Vendor-ID | LUID       |
|     |                                  |        |     |            | Device-ID | UUID       |
|     |                                  |        |     |            | Bus-ID    |            |
|---------------------------------------------------------------------------------------------|
| 0   | NVIDIA RTX A4500                 | Yes: 1 |     | 20716   MB | 10de      | 0          |
|     |                                  |        |     |            | 2232      | 1accb290.. |
|     |                                  |        |     |            | 1         |            |
|---------------------------------------------------------------------------------------------|
| 1   | NVIDIA RTX A4500                 | Yes: 2 |     | 20716   MB | 10de      | 0          |
|     |                                  |        |     |            | 2232      | 625bf251.. |
|     |                                  |        |     |            | 2b        |            |
|---------------------------------------------------------------------------------------------|
| 2   | NVIDIA RTX A4500                 | Yes: 0 |     | 20716   MB | 10de      | 0          |
|     |                                  |        |     |            | 2232      | cea0e031.. |
|     |                                  |        |     |            | 41        |            |
|---------------------------------------------------------------------------------------------|
| 3   | NVIDIA RTX A4500                 | Yes: 3 |     | 20716   MB | 10de      | 0          |
|     |                                  |        |     |            | 2232      | 29db3550.. |
|     |                                  |        |     |            | 61        |            |
|=============================================================================================|
| OS: 20.04.5 LTS (Focal Fossa) ubuntu, Version: 20.04.5, Kernel: 5.4.0-131-generic
| XServer Vendor: The X.Org Foundation, XServer Version: 12013000 (1.20.13.0)
| Processor: AMD Ryzen Threadripper PRO 5995WX 64-Cores
| Cores: 64 | Logical Cores: 128
|---------------------------------------------------------------------------------------------|
| Total Memory (MB): 257619 | Free Memory: 83191
| Total Page/Swap (MB): 18431 | Free Page/Swap: 18431
|---------------------------------------------------------------------------------------------|
2025-02-25 08:58:26 [2,010ms] [Warning] [gpu.foundation.plugin] IOMMU is enabled.
2025-02-25 08:58:26 [2,010ms] [Warning] [gpu.foundation.plugin] Detected IOMMU is enabled. Running CUDA peer-to-peer bandwidth and latency validation.
Unidirectional P2P=Enabled Bandwidth (P2P Writes) Matrix (GB/s)
   D\D     0      1      2      3 
     0 562.25   1.54   1.56   1.83 
     1   1.57 563.67   1.57   1.56 
     2   1.23   0.73 494.15   1.61 
     3   1.57   1.55   1.56 564.28 
P2P=Enabled Latency (P2P Writes) Matrix (us)
   GPU     0      1      2      3 
     0   1.80 49297.82 49297.76 49297.82 
     1 49297.57   1.64 49297.52 49297.54 
     2 49298.40 49298.00   1.50 49298.29 
     3 49297.34 49297.32 49297.34   1.50 

   CPU     0      1      2      3 
     0   2.33   1.97   2.72   2.04 
     1   2.04   2.37   1.85   2.05 
     2   2.38   2.80   2.43   1.93 
     3   2.04   2.04   2.47   2.36 
2025-02-25 08:59:32 [68,082ms] [Warning] [gpu.foundation.plugin] CUDA peer-to-peer observed bandwidth: 0.7 GB/s.
2025-02-25 08:59:32 [68,082ms] [Warning] [gpu.foundation.plugin] CUDA peer-to-peer observed latency: 49298.4 us.
2025-02-25 08:59:32 [68,082ms] [Warning] [gpu.foundation.plugin] Please verify if observed bandwidth and latency are expected.
[68.618s] [ext: omni.kit.pipapi-0.0.0] startup
[68.620s] [ext: omni.kit.pip_archive-0.0.0] startup
[68.620s] [ext: omni.kit.telemetry-0.5.1] startup
[68.654s] [ext: omni.kit.loop-default-0.2.0] startup
[68.655s] [ext: omni.appwindow-1.1.9] startup
[69.257s] [ext: omni.kit.renderer.core-1.0.2] startup
[73.256s] [ext: omni.kit.renderer.capture-0.0.0] startup
[73.259s] [ext: omni.kit.renderer.imgui-1.0.2] startup
[73.372s] [ext: omni.ui-2.26.5] startup
[73.381s] [ext: omni.kit.mainwindow-1.0.3] startup
[73.382s] [ext: carb.audio-0.1.0] startup
[73.405s] [ext: omni.uiaudio-1.0.0] startup
[73.406s] [ext: omni.kit.uiapp-0.0.0] startup
[73.406s] [ext: omni.isaac.compatibility_check-0.1.2] startup
[73.456s] 
[73.456s] =============================================
[73.456s] 
[73.456s] NVIDIA GPU(s)
[74.337s]   |-- Driver version [supported]
[74.337s]   |     |-- installed: 545.23.08
[74.337s]   |     |-- minimum: 535.129
[74.376s]   |-- GPU 0 [supported]
[74.376s]   |     |-- name: NVIDIA RTX A4500
[74.393s]   |-- GPU 1 [supported]
[74.393s]   |     |-- name: NVIDIA RTX A4500
[74.418s]   |-- GPU 2 [supported]
[74.418s]   |     |-- name: NVIDIA RTX A4500
[74.443s]   |-- GPU 3 [supported]
[74.443s]   |     |-- name: NVIDIA RTX A4500
[74.483s]   |-- GPU 0: VRAM [good]
[74.484s]   |     |-- total: 21.46 GB
[74.484s]   |     |-- minimum: 8 GB
[74.510s]   |-- GPU 1: VRAM [good]
[74.510s]   |     |-- total: 21.46 GB
[74.510s]   |     |-- minimum: 8 GB
[74.535s]   |-- GPU 2: VRAM [good]
[74.535s]   |     |-- total: 21.46 GB
[74.535s]   |     |-- minimum: 8 GB
[74.553s]   |-- GPU 3: VRAM [good]
[74.553s]   |     |-- total: 21.46 GB
[74.553s]   |     |-- minimum: 8 GB
[74.553s] 
[74.553s] CPU, RAM and Storage
[74.554s]   |-- CPU processor [supported]
[74.554s]   |     |-- name: AMD Ryzen Threadripper PRO 5995WX 64-Cores
[74.554s]   |-- CPU cores [excellent]
[74.554s]   |     |-- total: 128
[74.554s]   |     |-- minimum: 4
[74.554s]   |-- RAM [excellent]
[74.554s]   |     |-- total: 270.13 GB
[74.554s]   |     |-- minimum: 32 GB
[74.556s]   |-- Storage [enough (more is recommended)]
[74.557s]   |     |-- total available: 154.6 GB
[74.557s]   |     |-- minimum: 50 GB
[74.557s] 
[74.557s] Others
[74.557s]   |-- Operating system [supported]
[74.557s]   |     |-- name and version: Ubuntu 20.04.5 LTS
[74.779s]   |-- Display [available: 1 display(s)]
[74.779s] 
[74.779s] =============================================
[74.779s] 
[74.779s] System checking result: PASSED
[74.779s] 
[74.779s] =============================================
[74.779s] 
[74.783s] [ext: omni.isaac.sim.compatibility_check-4.5.0] startup
[74.901s] app ready
2025-02-25 08:59:43 [2,032ms] [Error] [omni.kit.registry.nucleus.index_v2.index_sync] Syncing registry index failed for url: 'https://ovextensionsprod.blob.core.windows.net/exts/kit/prod/106/shared/v2'. Exception: Traceback (most recent call last):
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 116, in _task
    self._task_uncaught()
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 136, in _task_uncaught
    self._registry_file = RegistryFile(self._local_path)
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/registry_file.py", line 28, in __init__
    data = json.loads(f.read())
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/python/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/python/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/python/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

2025-02-25 08:59:43 [2,034ms] [Error] [omni.kit.registry.nucleus.index_v2.index_sync] Syncing registry index failed for url: 'https://ovextensionsprod.blob.core.windows.net/exts/kit/prod/sdk/106.5/d02c707b/v2'. Exception: Traceback (most recent call last):
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 116, in _task
    self._task_uncaught()
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/index_sync.py", line 136, in _task_uncaught
    self._registry_file = RegistryFile(self._local_path)
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/extscore/omni.kit.registry.nucleus/omni/kit/registry/nucleus/index_v2/registry_file.py", line 28, in __init__
    data = json.loads(f.read())
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/python/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/python/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/noah/Downloads/isaac-sim-comp-check@4.5.0-rc.6+release.675.f1cca148.gl.linux-x86_64.release/kit/python/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

2025-02-25 08:59:43 [2,034ms] [Error] [omni.ext.plugin] Failed to resolve extension dependencies. Failure hints:
	[omni.app.mini-0.1.1] dependency: 'omni.kit.uiapp' = { version='^' } can't be satisfied. Available versions:
	 (none found)
 Synced registries:
	 - kit/default         : found 0 packages (couldn't connect or empty)
	 - kit/sdk             : found 0 packages (couldn't connect or empty)
	 - kit/prod/default    : found 0 packages (couldn't connect or empty)
	 - kit/prod/sdk        : found 0 packages (couldn't connect or empty)

2025-02-25 08:59:43 [2,035ms] [Error] [omni.kit.app.plugin] Exiting app because of dependency solver failure...

Checklist

• I have checked that there is no similar issue in the repo - there are some similar ones, but there was either no solution, the post was closed, and it was not applicable for my setup
• I have checked that the issue is not in running Isaac Sim itself and is related to the repo - although I get a similar error when running the Isaac sim compatibility error, Isaac sim the errors appear, but it doesn't seem to affect isaac sim performance, only isaac lab

Acceptance Criteria

• Criteria 1: ./isaaclab.sh -p scripts/tutorials/00_sim/create_empty.py runs with no issue
• Criteria 2: I am able to finish the installing Isaac lab tutoring and train a robot

[RandomOakForest]

Thank you for posting this. Could you let us know which steps you followed to install Isaac Lab? Thanks.

[NoahSTEMStuff]

Yeah, first I installed isaac sim through binaries(https://docs.isaacsim.omniverse.nvidia.com/latest/installation/install_workstation.html) then did

git clone git@github.com:isaac-sim/IsaacLab.git
# enter the cloned repository
cd IsaacLab
# create a symbolic link
ln -s ${HOME}/isaacsim _isaac_sim
# I skipped 'sudo apt install cmake build-essential' since they were already installed
./isaaclab.sh --install

But I believe I fixed my issue, I ran the following commands:

mv ~/.nvidia-omniverse ~/.nvidia-omniverse.bak
mv ~/.cache/ov ~/.cache/ov.bak
mv ~/.local/share/ov ~/.local/share/ov.bak

Now I can run the Isaac sim compatibility checker, Isaac Sim, and Isaac lab without crashing and without any errors involving synced registries. Training a policy also works fine.

[MiangChen]

Yeah, first I installed isaac sim through binaries(https://docs.isaacsim.omniverse.nvidia.com/latest/installation/install_workstation.html) then did

git clone git@github.com:isaac-sim/IsaacLab.git
# enter the cloned repository
cd IsaacLab
# create a symbolic link
ln -s ${HOME}/isaacsim _isaac_sim
# I skipped 'sudo apt install cmake build-essential' since they were already installed
./isaaclab.sh --install

But I believe I fixed my issue, I ran the following commands:

mv ~/.nvidia-omniverse ~/.nvidia-omniverse.bak
mv ~/.cache/ov ~/.cache/ov.bak
mv ~/.local/share/ov ~/.local/share/ov.bak

Now I can run the Isaac sim compatibility checker, Isaac Sim, and Isaac lab without crashing and without any errors involving synced registries. Training a policy also works fine.

Tks. Besides, after running these three lines of code, need to open a new terminal and re-run the previous command.

[Pipotheavenger]

Thanks Bro @MiangChen you saved all my project ! Thanks for posting the solution

[Shaw-Way]

Yeah, first I installed isaac sim through binaries(https://docs.isaacsim.omniverse.nvidia.com/latest/installation/install_workstation.html) then did

git clone git@github.com:isaac-sim/IsaacLab.git
# enter the cloned repository
cd IsaacLab
# create a symbolic link
ln -s ${HOME}/isaacsim _isaac_sim
# I skipped 'sudo apt install cmake build-essential' since they were already installed
./isaaclab.sh --install

But I believe I fixed my issue, I ran the following commands:

mv ~/.nvidia-omniverse ~/.nvidia-omniverse.bak
mv ~/.cache/ov ~/.cache/ov.bak
mv ~/.local/share/ov ~/.local/share/ov.bak

Now I can run the Isaac sim compatibility checker, Isaac Sim, and Isaac lab without crashing and without any errors involving synced registries. Training a policy also works fine.

Tks. Besides, after running these three lines of code, need to open a new terminal and re-run the previous command.

@MiangChen What command?

[yyh-ai]

If you are running ./isaaclab.sh --install in a virtual environment, you should check whether the download process completed successfully. I ran into issues when using the Tsinghua mirror, but it worked when I used the built-in source.