SFT OpenMathInstruct2 Example Fails Due to Incompatible Data Config

**Describe the bug**
Getting this error running the SFT example [here](https://docs.nvidia.com/nemo/rl/latest/guides/sft-openmathinstruct2.html#train-the-model) after logging into HF and WandB. The data configuration in /home/ameliay/RL/examples/configs/sft_openmathinstruct2.yaml is not compatible with run_sft.py. Fixed by setting num_worker=0.

**Steps/Code to reproduce bug**

run `uv run examples/run_sft.py --config=examples/configs/sft_openmathinstruct2.yaml` and then log into WandB

**Expected behavior**

The file should run smoothly without any error

**Additional context**

Add any other context about the problem here.