openai.BadRequestError: Error code: 400 - {'error': {'message': "Missing required parameter: 'response_format.json_schema'. (request id: 2024112108554660302290109985724)", 'type': 'invalid_request_error', 'param': 'response_format.json_schema', 'code': 'missing_required_parameter'}}

[WhyKathy]

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Why have this error?
from pydantic import BaseModel from openai import OpenAI class Step(BaseModel): explanation: str output: str class MathResponse(BaseModel): steps: list[Step] final_answer: str client = OpenAI(api_key=os.getenv('OA_OPENAI_KEY'),base_url=os.getenv('OA_OPENAI_BASE_URL')) completion = client.beta.chat.completions.parse( model="gpt-4o-2024-08-06", messages=[ {"role": "system", "content": "You are a helpful math tutor."}, {"role": "user", "content": "solve 8x + 31 = 2"}, ], response_format=MathResponse, ) message = completion.choices[0].message if message.parsed: print(message.parsed.steps) print(message.parsed.final_answer) else: print(message.refusal)