A window of "Isaac Sim" is not responding continues in the first run of 4.5.0 on Ubuntu 20.04

Omniverse Isaac Sim
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1

Hi, I’ve used Isaac Sim ago and trying to use new version again.

A window titled ““Isaac Sim” is not responding” appears very long time
after normal installation of Isaac Sim 4.5.0 in Ubuntu 20.04.

The result of the Isaac Sim Compatibility Checker was all ok.

After about 10 minutes passed long time, it shows the normal app.

But in every run, the same problem happens again.

Here is the terminal log:
Terminal log - Isaac Sim is not responding message.txt (49.5 KB)

It stuck with the following warning log:

2025-05-07 07:17:14 [27,067ms] [Warning] [omni.client.python] Detected a blocking function. This will cause hitches or hangs in the UI. Please switch to the async version:
File “PythonExtension.cpp::startup()”, line 2, in
File “/home/jong/isaacsim/kit/kernel/py/omni/ext/_impl/_internal.py”, line 328, in startup_extension
File “/home/jong/isaacsim/kit/kernel/py/omni/ext/_impl/_internal.py”, line 224, in startup
File “/home/jong/isaacsim/kit/kernel/py/carb/profiler/init.py”, line 99, in wrapper
File “/home/jong/isaacsim/kit/kernel/py/omni/ext/_impl/_internal.py”, line 164, in _startup_ext
File “/home/jong/isaacsim/exts/isaacsim.sensors.camera.ui/isaacsim/sensors/camera/ui/extension.py”, line 25, in on_startup
File “/home/jong/isaacsim/exts/isaacsim.storage.native/isaacsim/storage/native/nucleus.py”, line 473, in get_assets_root_path
File “/home/jong/isaacsim/exts/isaacsim.storage.native/isaacsim/storage/native/nucleus.py”, line 196, in check_server
File “/home/jong/isaacsim/kit/extscore/omni.client.lib/omni/client/impl/init.py”, line 130, in stat

After about 10 min passes, it shows the below log:

2025-05-07 07:28:35 [707,842ms] [Error] [carb.scripting-python.plugin] RuntimeError: Could not find assets root folder

At:
/home/jong/isaacsim/exts/isaacsim.storage.native/isaacsim/storage/native/nucleus.py(480): get_assets_root_path
/home/jong/isaacsim/exts/isaacsim.sensors.camera.ui/isaacsim/sensors/camera/ui/extension.py(25): on_startup
/home/jong/isaacsim/kit/kernel/py/omni/ext/_impl/_internal.py(164): _startup_ext
/home/jong/isaacsim/kit/kernel/py/carb/profiler/init.py(101): wrapper
/home/jong/isaacsim/kit/kernel/py/omni/ext/_impl/_internal.py(224): startup
/home/jong/isaacsim/kit/kernel/py/omni/ext/_impl/_internal.py(328): startup_extension
PythonExtension.cpp::startup()(2):

2025-05-07 07:28:35 [707,842ms] [Error] [omni.ext.plugin] [ext: isaacsim.sensors.camera.ui-0.1.4] Failed to startup python extension.

And then soon the normal app windows appears.

The cause may be related to the error above: “RuntimeError: Could not find assets root folder”.

How can we fix it?

Isaac Sim Version

[V] 4.5.0
4.2.0
4.1.0
4.0.0
4.5.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Operating System

Ubuntu 22.04
[V] Ubuntu 20.04
Windows 11
Windows 10
Other (please specify):

GPU Information

  • Model: RTX A6000
  • Driver Version: 570.144
2

Today, it works after download and install of Isaac Sim Assets.

So now I am using the local assets as the instruction:
https://docs.isaacsim.omniverse.nvidia.com/latest/installation/install_faq.html#isaac-sim-setup-assets-content-pack

Maybe, the cause of problem is the blocking of network access to Cloud by my company for security?

3

You can verify if your network can access the default Isaac Sim asset server at
https://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Isaac/4.5.