runtime error

Exit code: 1. Reason: /home/user/app/app.py:15: LangChainDeprecationWarning: The class `ChatOpenAI` was deprecated in LangChain 0.0.10 and will be removed in 1.0. An updated version of the class exists in the :class:`~langchain-openai package and should be used instead. To use it run `pip install -U :class:`~langchain-openai` and import as `from :class:`~langchain_openai import ChatOpenAI``. llm = ChatOpenAI() Traceback (most recent call last): File "/home/user/app/app.py", line 15, in <module> llm = ChatOpenAI() File "/usr/local/lib/python3.10/site-packages/langchain_core/_api/deprecation.py", line 216, in warn_if_direct_instance return wrapped(self, *args, **kwargs) File "/usr/local/lib/python3.10/site-packages/langchain_core/load/serializable.py", line 111, in __init__ super().__init__(*args, **kwargs) File "/usr/local/lib/python3.10/site-packages/pydantic/main.py", line 212, in __init__ validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self) pydantic_core._pydantic_core.ValidationError: 1 validation error for ChatOpenAI Value error, Did not find openai_api_key, please add an environment variable `OPENAI_API_KEY` which contains it, or pass `openai_api_key` as a named parameter. [type=value_error, input_value={'model_kwargs': {}, 'nam...ne, 'http_client': None}, input_type=dict] For further information visit https://errors.pydantic.dev/2.9/v/value_error

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