omni.replicator.core fails to load with warp 1.13.0 due to removed wp.context.Kernel API

[Mengarr]

Description

Summary

omni.replicator.core (and downstream isaacsim.core.nodes) fail to load on
the dev2 build of Isaac Sim 6.0.0 when the extension resolver picks up
omni.warp.core-1.13.0 from the public registry. The replicator uses
wp.context.Kernel, which was removed in warp 1.13.0 (now wp.Kernel).

Environment

• Isaac Sim: 6.0.0 dev2, built from source
• OS: Ubuntu (linux-x86_64)
• warp resolved: omni.warp.core-1.13.0 (published to registry ~May 2026)

Steps to Reproduce

1. Build Isaac Sim 6.0.0 dev2 from source
2. Run ./isaac-sim.sh after omni.warp.core-1.13.0 was published to the
   extension registry (early May 2026)

Error

[Error] [omni.ext._impl._internal] Failed to import python module omni.replicator.core ...
Error: module 'warp' has no attribute 'context'. Traceback:

AttributeError: module 'warp' has no attribute 'context'. Did you mean: 'constant'?
File "/home/ubuntu/.local/share/ov/data/Kit/Isaac-Sim Full/6.0/exts/3/omni.replicator.core-1.13.4+110.0.0.lx64.r.cp312/omni/replicator/core/scripts/annotators.py", line 314, in Augmentation

[Error] [omni.ext._impl._internal] Failed to import python module isaacsim.core.nodes from /home/ubuntu/IsaacSim/exts/isaacsim.core.nodes. ...
Error: module 'omni.replicator.core' has no attribute 'Writer'.

Root Cause

omni.replicator.core-1.13.4 references wp.context.Kernel in (at least) 3
files:

• omni/replicator/core/scripts/annotators.py (lines 183, 314, 359, 365, 1452, 1487, 1489, 2164)
• omni/replicator/core/scripts/writers.py (line 440)
• omni/replicator/core/ogn/python/impl/nodes/OgnAugment.py (line 214)

warp.context.Kernel was removed in warp 1.13.0; the equivalent is now
warp.Kernel directly. Because the replicator declares "omni.warp.core" = {}
(no upper bound), anyone who first ran the dev2 build after warp 1.13.0 landed
in the registry will have 1.13.0 cached and hit this error.

Workaround

Replace all wp.context.Kernel → wp.Kernel in the three files listed above
inside the cached extension directory:
~/.local/share/ov/data/Kit/Isaac-Sim Full/6.0/exts/3/omni.replicator.core-1.13.4+110.0.0.lx64.r.cp312/

Proposed Fix

Either:

1. Pin "omni.warp.core" to ">=1.12,<1.13" in omni.replicator.core's
   extension.toml until the API is updated, or
2. Update all wp.context.Kernel references in omni.replicator.core to
   wp.Kernel to support warp 1.13.0+

Isaac Sim version

6.0.0-rc.22

Operating System (OS)

Ubuntu 24.04

GPU Name

Tesla T4

GPU Driver and CUDA versions

Driver Version: 580.159.03 CUDA Version: 13.0

Logs

No response

Additional information

No response

[PeterL-NV]

Hi, thanks for the reports! The diagnosis is exactly right and we reproduced it on our end. Good news is there's already a fix upstream.

omni.replicator.core-1.13.20+110.1.1 ships a compatibility shim:

  # `wp.Kernel` was introduced in a newer version of warp; fall back to the legacy `wp.context.Kernel`
  _WarpKernel = getattr(wp, "Kernel", None) or wp.context.Kernel

We verified the shim works against both warp 1.13.0 (getattr short-circuits to wp.Kernel) and warp 1.12.x (falls through to the legacy path). So this is your option 2 from the proposed fixes — already shipped.

Recommended workaround

Rather than editing the cached extension files (which are fragile and get overwritten next time the resolver updates), the cleanest path is to pull the newer replicator. A few options, in order of preference:

1. Force-pin replicator in your app's .kit file to >=1.13.20:
   "omni.replicator.core" = { version = "1.13.20" }
2. Pin warp downward in your app's .kit file as an interim measure:
   "omni.warp.core" = { version = "1.12.0" }
3. Wait for the next dev build that picks up replicator 1.13.20 by default.

We're tracking the dev2-side resolver update separately so the fix flows through automatically.

[Mengarr]

Thanks for your quick response!

I tried pining to 1.13.20 but it's not available in any of the public registries yet.

In the meantime, I'll use the warp downpin workaround.