server示例代码有错误：

[4AM-GodVZz]

def encode(self, event: BaseEvent) -> str:
    """
    Encodes an event.
    """
    return self._encode_sse(event)

def _encode_sse(self, event: BaseEvent) -> str:
    """
    Encodes an event into an SSE string.
    """
    return f"data: {event.model_dump_json(by_alias=True, exclude_none=True)}\n\n"

                yield encoder.encode({
                    "type": EventType.TEXT_MESSAGE_CHUNK,
                    "message_id": message_id,
                    "delta": chunk.choices[0].delta.content,
                })
            Handle tool call chunks

dict object has no attribute "model_dump_json"
why you yield dict??

[ltanme]

What large language model do you use?