[Installation issues] Please help

[lanix09]

Hi,

I tried to install Isaac Lab for several days now without success. I'm quite desperate and will take any help that you could provide.
I will try to give you as much details as possible but feel free to ask me more information.

I'm on Windows 11 (25H2) and I followed the documentation for installation. I first installed Isaac Sim (5.1.0 with binaries) and it works well, I've done the first tutos without issue.
Then, I followed the doc to install last version of Isaac Lab (2.3.2) and I initially faced an issue with h5py but found a thread suggesting to force the version in setup.py file with "h5py==3.15.1" and it dis the job, I now have a successful installation. My problem is happening when trying to run the example (mentioned at the end of install doc) :
isaaclab.bat -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0
I have a crash right after the message "Simulation App Startup Complete", which is : "Windows fatal exception: access violation".
If I launched a simple test to create an empty project, it works fine, so it seems related to RL part.
I attach the full log here :
log.txt

I've tried several things like :
complete re-installation
driver downgrade to 580.88

but no success

My GPU is an RTX 5080 with 16GB VRAM - CPU is Intel(R) Core(TM) Ultra 7 265KF - RAM is 32GB. should be more than enough to run the example.

Please help 🙏

[Lk13Antkoo]

Hi, did you solve the problem, I got the same issua too :<

[d-kleine]

Did you clone the IsaacLab repo and ran the installation on it's main branch? My guess is when it's checked out at the main branch branch, it might be already at v3 beta state. Isaac Lab v3 depends on Isaac Sim 6.0, which requires Python 3.12.

Please try to check out the IsaacLab repo at tag v2.3.2 and run the installation again with a Python 3.11 interpreter.

[lanix09]

I just tried but same result.
I tried as hard as I could, I uninstalled everything, including all python packages, then clone the v2.3.2 tag and start from scratch all installations in a new terminal and I end up in exact same situation.
Would it be a way to know if it's a python issue (dependency, version, etc.) or a deeper issue, like nvidia driver compatibility, hardware compatibility, windows version or something else ?

[d-kleine]

I just re-installed Isaac Lab 2.3.2, and still no issues for me. I have used the installation approach described in #4207.

• Which Python interpreter did you use to install Isaac Lab?
• Did you try isaaclab.bat --install rsl_rl to install rsl_rl again?
• Does headless mode (isaaclab.bat -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0 --headless) work for you?
• Is there any error message in the console?
• Do you have a crash report?

[lanix09]

For python, I tried with the provided one inside Isaac Sim 5.1.0 (version 3.11.13) and also an independent installation with version 3.11.6.

I tried your command to re-install rsl_rl only but same results.

headless is also crashing and I attach the 2 logs, log_1 for non-headless command and log_2 for headless

log_1.txt
log_2.txt

If you can find anything in them

[d-kleine]

I just took a look into the logs. What wonders me are the Thread warnings before the File "<frozen importlib._bootstrap>" errors. Do you use some kind of GPU under-/overclocking software such as MSI Afterburner? If so, please see here:
https://forums.developer.nvidia.com/t/windows-fatal-exception-int-divide-by-zero/313166

[confused-quack]

I did this and it's working for me now:
pip install tensordict==0.9.0
pip install h5py==3.11.0 --force-reinstall --no-cache-dir
.\isaaclab.bat -p -m pip install rsl-rl-lib==3.0.1

[ohban730]

I'm sharing this as a reference.
I successfully ran the example training on a Windows machine with an RTX 5090.
Here is the environment and the steps I took:

Environment

• GPU: RTX 5090 (Driver: 581.42)
• CPU: Ryzen 9 9950X3D
• OS: Windows 11
• Isaac Sim: 5.1
• rsl-rl-lib: 5.0.1

Steps I took

1. pip install tensordict==0.9.0
   I downgraded tensordict's version from 0.12.2 to 0.9.0 .
2. pip install h5py==3.11.0 --force-reinstall --no-cache-dir
   I downgraded h5py's version from 3.15.1 to 3.11.0 .
3. .\isaaclab.bat -p -m pip install rsl-rl-lib==3.0.1
   But I couldnt run the example training on my machine.
4. .\isaaclab.bat -p -m pip uninstall rsl-rl-lib
5. .\isaaclab.bat -p -m pip install rsl-rl-lib==5.0.1
6. I successfully ran below
   isaaclab.bat -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0 --headless
   isaaclab.bat -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0
   isaaclab.bat -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Velocity-Rough-Anymal-C-v0

Environment Details (pip list , pip check)

Below is the full package list and check result for my working environment.

Click to expand pip list, pip chek

Package                    Version      Editable project location
-------------------------- ------------ -----------------------------------------------
absl-py                    2.4.0
aioboto3                   15.1.0
aiobotocore                2.24.0
aiodns                     3.1.1
aiofiles                   23.2.1
aiohappyeyeballs           2.4.4
aiohttp                    3.11.11
aioitertools               0.11.0
aiosignal                  1.3.2
annotated-types            0.7.0
antlr4-python3-runtime     4.9.3
anyio                      4.13.0
asteval                    1.0.6
asttokens                  3.0.1
async-timeout              5.0.1
attrs                      25.1.0
awscrt                     0.23.8
azure-core                 1.28.0
azure-identity             1.13.0
azure-storage-blob         12.17.0
boto3                      1.39.11
botocore                   1.39.11
certifi                    2026.4.22
cffi                       2.0.0
charset-normalizer         3.3.2
click                      8.1.7
cloudpickle                3.1.2
colorama                   0.4.6
comm                       0.2.3
contourpy                  1.3.1
coverage                   7.4.4
cryptography               44.0.0
cycler                     0.11.0
decorator                  5.2.1
einops                     0.8.2
executing                  2.2.1
Farama-Notifications       0.0.6
fastapi                    0.115.7
filelock                   3.13.1
flaky                      3.8.1
flatdict                   4.1.0
fonttools                  4.55.3
frozenlist                 1.5.0
fsspec                     2024.6.1
gitdb                      4.0.12
GitPython                  3.1.50
grpcio                     1.80.0
gunicorn                   23.0.0
gym                        0.23.1
gym-notices                0.1.0
gymnasium                  1.2.1
h11                        0.16.0
h5py                       3.11.0
hidapi                     0.14.0.post2
httptools                  0.6.1
huggingface_hub            0.36.2
hydra-core                 1.3.2
idna                       3.10
idna-ssl                   1.1.0
imageio                    2.37.0
imageio-ffmpeg             0.6.0
importlib_metadata         9.0.0
iniconfig                  2.3.0
ipython                    9.13.0
ipython_pygments_lexers    1.1.1
ipywidgets                 8.1.5
isaaclab                   0.54.3       C:\Users\owner\IsaacLab\source\isaaclab
isaaclab_assets            0.2.4        C:\Users\owner\IsaacLab\source\isaaclab_assets
isaaclab_contrib           0.0.2        C:\Users\owner\IsaacLab\source\isaaclab_contrib
isaaclab_mimic             1.0.16       C:\Users\owner\IsaacLab\source\isaaclab_mimic
isaaclab_rl                0.5.1        C:\Users\owner\IsaacLab\source\isaaclab_rl
isaaclab_tasks             0.11.16      C:\Users\owner\IsaacLab\source\isaaclab_tasks
isaacsim                   5.1.0.0
isaacsim-app               5.1.0.0
isaacsim-asset             5.1.0.0
isaacsim-benchmark         5.1.0.0
isaacsim-code-editor       5.1.0.0
isaacsim-core              5.1.0.0
isaacsim-cortex            5.1.0.0
isaacsim-example           5.1.0.0
isaacsim-extscache-kit     5.1.0.0
isaacsim-extscache-kit-sdk 5.1.0.0
isaacsim-extscache-physics 5.1.0.0
isaacsim-gui               5.1.0.0
isaacsim-kernel            5.1.0.0
isaacsim-replicator        5.1.0.0
isaacsim-rl                5.1.0.0
isaacsim-robot             5.1.0.0
isaacsim-robot-motion      5.1.0.0
isaacsim-robot-setup       5.1.0.0
isaacsim-ros1              5.1.0.0
isaacsim-ros2              5.1.0.0
isaacsim-sensor            5.1.0.0
isaacsim-storage           5.1.0.0
isaacsim-template          5.1.0.0
isaacsim-test              5.1.0.0
isaacsim-utils             5.1.0.0
isodate                    0.6.1
jedi                       0.20.0
Jinja2                     3.1.6
jmespath                   1.0.1
jsonschema                 4.26.0
jsonschema-specifications  2025.9.1
junitparser                5.0.0
jupyterlab_widgets         3.0.16
kiwisolver                 1.4.4
llvmlite                   0.42.0
Markdown                   3.10.2
markdown-it-py             4.2.0
MarkupSafe                 2.1.3
matplotlib                 3.10.3
matplotlib-inline          0.2.2
mdurl                      0.1.2
ml_dtypes                  0.5.4
moviepy                    2.2.1
mpmath                     1.3.0
msal                       1.27.0
msal-extensions            1.0.0
msgpack                    1.1.2
multidict                  6.1.0
nest-asyncio               1.5.6
networkx                   3.3
numba                      0.59.1
numpy                      2.4.4
oauthlib                   3.2.2
omegaconf                  2.3.0
onnx                       1.21.0
onnx-ir                    0.2.1
onnxscript                 0.7.0
opencv-python-headless     4.11.0.86
orjson                     3.11.9
osqp                       0.6.7.post3
packaging                  23.0
pandas                     3.0.2
parso                      0.8.7
pillow                     11.3.0
Pint                       0.20.1
pip                        26.0.1
platformdirs               4.9.6
pluggy                     1.6.0
portalocker                2.7.0
prettytable                3.3.0
proglog                    0.1.12
prompt_toolkit             3.0.52
propcache                  0.2.1
protobuf                   7.34.1
psutil                     5.9.8
pure_eval                  0.2.3
pycares                    4.8.0
pycparser                  3.0
pydantic                   2.11.10
pydantic_core              2.33.2
pyglet                     1.5.31
Pygments                   2.20.0
PyJWT                      2.12.1
pyparsing                  3.0.9
pyperclip                  1.8.0
pypng                      0.20220715.0
pytest                     9.0.3
pytest-mock                3.15.1
python-dateutil            2.9.0.post0
python-dotenv              1.2.2
python-multipart           0.0.20
pytz                       2024.1
pyvers                     0.2.2
pywin32                    306
PyYAML                     6.0.2
qdldl                      0.1.7.post5
qrcode                     7.4.2
ray                        2.52.1
referencing                0.37.0
regex                      2026.4.4
requests                   2.32.3
requests-oauthlib          1.3.1
rich                       15.0.0
rl_games                   1.6.1
rpds-py                    0.30.0
rsl-rl-lib                 5.0.1
Rtree                      1.3.0
s3transfer                 0.13.1
safetensors                0.7.0
scipy                      1.15.3
sentry-sdk                 2.29.1
setproctitle               1.3.7
setuptools                 81.0.0
six                        1.17.0
skrl                       2.0.0
smmap                      5.0.3
stable_baselines3          2.8.0
stack-data                 0.6.3
starlette                  0.49.1
sympy                      1.13.3
tensorboard                2.20.0
tensorboard-data-server    0.7.2
tensorboardX               2.6.5
tensordict                 0.9.0
tokenizers                 0.22.2
toml                       0.10.2
tomli                      2.4.1
torch                      2.7.0+cu128
torchaudio                 2.7.0
torchvision                0.22.0+cu128
tornado                    6.5.1
tqdm                       4.67.3
traitlets                  5.15.0
transformers               4.57.6
trimesh                    4.5.1
typing_extensions          4.12.2
typing-inspection          0.4.2
tzdata                     2026.2
urllib3                    2.7.0
uvicorn                    0.29.0
wandb                      0.26.1
warp-lang                  1.13.0
watchdog                   4.0.0
wcwidth                    0.7.0
websockets                 12.0
Werkzeug                   3.1.8
wheel                      0.46.3
widgetsnbextension         4.0.15
wrapt                      1.16.0
yarl                       1.18.3
zipp                       3.23.1

---------------------------------------------------------------------------------------------------

fastapi 0.115.7 has requirement starlette<0.46.0,>=0.40.0, but you have starlette 0.49.1.
ipython 9.13.0 has requirement psutil>=7, but you have psutil 5.9.8.
isaaclab 0.54.3 has requirement numpy<2, but you have numpy 2.4.4.
isaaclab-rl 0.5.1 has requirement h5py==3.15.1, but you have h5py 3.11.0.
isaaclab-rl 0.5.1 has requirement numpy<2, but you have numpy 2.4.4.
isaaclab-tasks 0.11.16 has requirement numpy<2, but you have numpy 2.4.4.
isaacsim-kernel 5.1.0.0 has requirement numpy==1.26.0, but you have numpy 2.4.4.
numba 0.59.1 has requirement numpy<1.27,>=1.22, but you have numpy 2.4.4.
wheel 0.46.3 has requirement packaging>=24.0, but you have packaging 23.0.

[applepope]

A few days ago, while configuring the main version of iassc lab, I found that according to the official documentation, I was able to run iassc sim correctly and run empty routines and demos after configuring iassc lab. However, I was unable to run the rel rl training framework (such as the routines in the official documentation. As far as I know, the affected learning frameworks include rsl rl, rl games, etc.). I have resolved the issue and shared it with you. If you also encounter a similar situation, you can refer to it: the root cause is that the Tensordict library underwent a major version iteration in April 2026 from 0.11.0 to>0.12.0 (the latest default installation version is 0.12.3). According to the official description, this update made significant adjustments to the underlying structure (directly causing Python 3.9 to not rely on this library, which actually affects the compatibility of subsequent versions such as Python 3.10 and Python 3.11). If you also have a similar memory removal issue, please roll back the latest version of the Tensordict library to version 0.11.0. There are no restrictions on the Tensordict library version in the RL framework setup. py file of IASSC Lab. Please be aware of this. Therefore, I suggest rolling back the Tensordict library version first after completing the configuration of the IASSC lab and RL framework. you can see in #5652

[doslke]

Thanks! It works for me:
pip install tensordict==0.11.0
pip install h5py==3.11.0 --force-reinstall --no-cache-dir

[camirian]

Summary & Root Cause Analysis

Building on the helpful notes from @applepope and @doslke, the Access Violation crash (0xC0000005) on Windows during RL environment execution stems from a combination of ABI mismatch (NumPy 2.x) and CUDA tensor allocation changes in tensordict > 0.11.0.

Looking at the provided pip list output:

• numpy 2.4.4 violates isaacsim-kernel (numpy==1.26.0) and Isaac Lab core (numpy<2).
• tensordict > 0.11.0 triggers memory access violations on Windows when PyTorch allocates GPU tensors during env reset.

---

Clean Recovery Procedure

Rather than manually modifying metadata or setup.py files, restore environment compatibility with the following sequence:

# 1. Activate your Conda/Isaac Lab environment
conda activate isaaclab

# 2. Downgrade NumPy to 1.26.4 (ABI compatible with Isaac Sim 4.5/5.1)
pip install "numpy<2.0.0,>=1.26.0" --force-reinstall

# 3. Pin Tensordict to 0.11.0 (prevents Windows C++ memory access violations)
pip install "tensordict==0.11.0" --force-reinstall --no-cache-dir

# 4. Re-verify h5py version compatibility
pip install "h5py==3.11.0"

---

Clean Environment Verification Sequence

Test environment stability with a headless RL environment step:

# Run standard Cartpole RL task test
.\isaaclab.bat -p source\standalone\workflows\rsl_rl\train.py --task Isaac-Cartpole-v0 --headless --num_envs 64

---

Additional Diagnostic Information (If Issue Persists)

If an Access Violation still occurs after enforcing numpy<2 and tensordict==0.11.0, please provide:

1. GPU & Driver Version: (e.g. RTX 4090 / 5080 with Game Ready / Studio Driver version).
2. Isaac Sim Kit Crash Log: Located at %USERPROFILE%\.nvidia-omniverse\logs\Kit\Isaac-Sim\5.1\kit.log.