Isaac Lab training crashes on Windows fatal exception: code 0xc0000139

[rmzmrnn]

Hello 👋 I am new to using Isaac Sim and Isaac Lab. I installed them using this instruction:
Installation using Isaac Sim Pre-built Binaries

When I reached the Train a robot! section, I ran the command without --headless.

Expected behavior: The simulation window should launch and training should start.
Actual behavior: The app shows warnings/errors and then closes.

Command:
isaaclab.bat -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Ant-v0

Relevant error from logs:
Windows fatal exception: code 0xc0000139

Full logs:
https://github.com/user-attachments/files/27407639/isaac_sim_lab_logs.txt

System specs:

|---------------------------------------------------------------------------------------------|
| Driver Version: 591.86        | Graphics API: Vulkan
|=============================================================================================|
| GPU | Name                             | Active | LDA | GPU Memory | Vendor-ID | LUID       |
|     |                                  |        |     |            | Device-ID | UUID       |
|     |                                  |        |     |            | Bus-ID    |            |
|---------------------------------------------------------------------------------------------|
| 0   | NVIDIA GeForce RTX 3050          | Yes: 0 |     | 8256    MB | 10de      | 3e300100.. |
|     |                                  |        |     |            | 2582      | 061e7188.. |
|     |                                  |        |     |            | 6         |            |
|=============================================================================================|
| OS: Windows 11 Home Single Language, Version: 10.0 (25H2), Build: 26200, Kernel: 10.0.26100.8328
| Processor: AMD Ryzen 7 5700X 8-Core Processor
| Cores: 8 | Logical Cores: 16
|---------------------------------------------------------------------------------------------|
| Total Memory (MB): 16306 | Free Memory: 6451
| Total Page/Swap (MB): 28082 | Free Page/Swap: 9318
|---------------------------------------------------------------------------------------------|

• Should I try to reinstall Isaac Sim and Isaac Lab in a different way?
• What should I check first (PATH, drivers, Python environment, etc.)?

[d-kleine]

You have used the pip installation approach (according to your log), not the pre-built binaries, right?
With reference to your log, this looks like the h5py issue, please see #5076

[rmzmrnn]

Yep, I used the pip installation approach. Installing h5py==3.15.1 fixed the issue.
Thank you for pointing me to #5076 .