Cannot join live session

Accelerated Computing Aerial Forum
1

Hi,

I am not able to start a simulation. I am having the following error:
2025-03-05 11:15:23 [Error] [omni.kit.usd.layers.plugin] Cannot create session for layer /home/aerial/mit.usdc. A live-able layer must be in Nucleus server and not with .live extension.
2025-03-05 11:15:24 [Error] [asyncio] Task exception was never retrieved
2025-03-05 11:15:24 [Error] [asyncio] future: <Task finished name=‘Task-4500’ coro=<TLB_Extension._show_live_session_prompt..on_join() done, defined at /home/aerial/.local/share/ov/pkg/aodt-1.2.0/exts/aodt.toolbar/aodt/toolbar/extension.py:1040> exception=AttributeError(“‘NoneType’ object has no attribute ‘_session_handle’”)>
2025-03-05 11:15:24 [Error] [asyncio] Traceback (most recent call last):
2025-03-05 11:15:24 [Error] [asyncio] File “/home/aerial/.local/share/ov/pkg/aodt-1.2.0/exts/aodt.toolbar/aodt/toolbar/extension.py”, line 1041, in on_join
2025-03-05 11:15:24 [Error] [asyncio] success = await get_worker_manager_instance().create_or_join_live_session()
2025-03-05 11:15:24 [Error] [asyncio] File “/home/aerial/.local/share/ov/pkg/aodt-1.2.0/exts/aodt.configuration/aodt/configuration/worker_manager.py”, line 1039, in create_or_join_live_session
2025-03-05 11:15:24 [Error] [asyncio] success = live_syncing.join_live_session(live_session)
2025-03-05 11:15:24 [Error] [asyncio] File “/home/aerial/.local/share/ov/pkg/aodt-1.2.0/extscache/omni.kit.usd.layers-2.1.31+3a7abd1c.lx64.r.cp310/omni/kit/usd/layers/_impl/live_syncing.py”, line 598, in join_live_session
2025-03-05 11:15:24 [Error] [asyncio] session_handle = live_session._session_handle
2025-03-05 11:15:24 [Error] [asyncio] AttributeError: ‘NoneType’ object has no attribute ‘_session_handle’
2025-03-05 11:15:35 [Error] [omni.kit.usd.layers.plugin] Cannot create session for layer /home/aerial/mit.usdc. A live-able layer must be in Nucleus server and not with .live extension.
2025-03-05 11:15:35 [Error] [asyncio] Task exception was never retrieved
2025-03-05 11:15:35 [Error] [asyncio] future: <Task finished name=‘Task-4502’ coro=<TLB_Extension._show_live_session_prompt..on_join() done, defined at /home/aerial/.local/share/ov/pkg/aodt-1.2.0/exts/aodt.toolbar/aodt/toolbar/extension.py:1040> exception=AttributeError(“‘NoneType’ object has no attribute ‘_session_handle’”)>
2025-03-05 11:15:35 [Error] [asyncio] Traceback (most recent call last):
2025-03-05 11:15:35 [Error] [asyncio] File “/home/aerial/.local/share/ov/pkg/aodt-1.2.0/exts/aodt.toolbar/aodt/toolbar/extension.py”, line 1041, in on_join
2025-03-05 11:15:35 [Error] [asyncio] success = await get_worker_manager_instance().create_or_join_live_session()
2025-03-05 11:15:35 [Error] [asyncio] File “/home/aerial/.local/share/ov/pkg/aodt-1.2.0/exts/aodt.configuration/aodt/configuration/worker_manager.py”, line 1039, in create_or_join_live_session
2025-03-05 11:15:35 [Error] [asyncio] success = live_syncing.join_live_session(live_session)
2025-03-05 11:15:35 [Error] [asyncio] File “/home/aerial/.local/share/ov/pkg/aodt-1.2.0/extscache/omni.kit.usd.layers-2.1.31+3a7abd1c.lx64.r.cp310/omni/kit/usd/layers/_impl/live_syncing.py”, line 598, in join_live_session
2025-03-05 11:15:35 [Error] [asyncio] session_handle = live_session._session_handle
2025-03-05 11:15:35 [Error] [asyncio] AttributeError: ‘NoneType’ object has no attribute ‘_session_handle’

2

Hi @subhams
Which map are you trying to run the simulation on?

3

I have downloaded a map of MIT using the OSM import tool. I have attached the USD file here.
mit.zip (12.5 MB)

4

I had copied the USD file into the omniverse-server to enable the live mode. However, when I started the simulation, it showed that there was not enough GPU memory available. I restarted the server. But after restarting, I am not able to see the GPUs. Here is the error:

2025-03-05_13-38
2025-03-05_13-381844×890 122 KB

5

Please perform a cold reboot of the server including the GPUs and try again.
Which GPUs are you using for the front and backends?

6

Both the GPUs are RTX 6000 Ada.

7

ok, if the problem persists, please consider reflashing your server with a fresh OS and then installing AODT from scratch.

8

I am not able to see any traced paths in the simulation:

image
image1700×883 111 KB

9

Hi @subhams
Can you please provide details regarding your simulation parameters:

  • #of UEs, location and waypoints
  • #of RUs and location
  • Simulation time (duration or slots)
  • Map being used
10

I am using the tokyo.usd map. Here is the attachment of the scene:

image
image1815×976 105 KB

#of UEs 1, no waypoints.
#of RUs 1, location:

image
image784×362 30 KB

Simulation time 10s, interval 0.1s.

11

Hi @subhams
To see the propagation rays between RU and UE, please select the “Enable Rays from” option from the UEs property menu.