[ragesh2000 (reporter)]: Adding api_style="function" helped me to get rid of that error message. But now also the problem is my assistant agent is aware of the function to use but not the user proxy. Is that the issue with the model iam using ? @ekzhu [image]

Context: GitHub issue microsoft/autogen#1150 (closed, 32 comments): I was following exactly as the notebook for function calling [https://github.com/microsoft/autogen/blob/main/notebook/agentchat_function_call_currency_calculator.ipynb](url) but instead of the output shown there Iam keep on getting an error [image] The only change i made is instead of open ai model i used open source model using litellm. Can anybody tell me why it is happening ?