runtime error

Exit code: 1. Reason: sys:1: LangChainDeprecationWarning: As of langchain-core 0.3.0, LangChain uses pydantic v2 internally. The langchain_core.pydantic_v1 module was a compatibility shim for pydantic v1, and should no longer be used. Please update the code to import from Pydantic directly. For example, replace imports like: `from langchain_core.pydantic_v1 import BaseModel` with: `from pydantic import BaseModel` or the v1 compatibility namespace if you are working in a code base that has not been fully upgraded to pydantic 2 yet. from pydantic.v1 import BaseModel Traceback (most recent call last): File "/home/user/app/app.py", line 9, in <module> chat = ChatOpenAI() File "/usr/local/lib/python3.10/site-packages/langchain_core/load/serializable.py", line 125, 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) File "/usr/local/lib/python3.10/site-packages/langchain_openai/chat_models/base.py", line 562, in validate_environment self.root_client = openai.OpenAI(**client_params, **sync_specific) # type: ignore[arg-type] File "/usr/local/lib/python3.10/site-packages/openai/_client.py", line 110, in __init__ raise OpenAIError( openai.OpenAIError: The api_key client option must be set either by passing api_key to the client or by setting the OPENAI_API_KEY environment variable

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