which is causing the error message "missing role for choice 0."

[coding4j-dph]

Hello, I now have Microsoft's OpenAI interface. I have encapsulated it locally and configured my developed interface with seting.json. It can now be debugged, but there is still a small issue with the streaming interface. Every time the model returns, it will prompt a message: missing role for choice 0， May I ask where the problem lies? Thank you