function call dataset can not be trained

when i try to train model with function dataset, an error occurs as following:

<img width="1713" height="243" alt="Image" src="https://github.com/user-attachments/assets/2e3df658-e58c-41e8-8d1e-5b00e4dad7ae" />

the error can be reproduced by using the data/glaive_toolcall_zh_demo.json.