runtime error

/home/user/.local/lib/python3.10/site-packages/langchain/chat_models/__init__.py:31: LangChainDeprecationWarning: Importing chat models from langchain is deprecated. Importing from langchain will no longer be supported as of langchain==0.2.0. Please import from langchain-community instead: `from langchain_community.chat_models import ChatOpenAI`. To install langchain-community run `pip install -U langchain-community`. warnings.warn( /home/user/.local/lib/python3.10/site-packages/langchain_core/_api/deprecation.py:117: LangChainDeprecationWarning: The class `langchain_community.chat_models.openai.ChatOpenAI` was deprecated in langchain-community 0.0.10 and will be removed in 0.2.0. An updated version of the class exists in the langchain-openai package and should be used instead. To use it run `pip install -U langchain-openai` and import as `from langchain_openai import ChatOpenAI`. warn_deprecated( Traceback (most recent call last): File "/home/user/app/app.py", line 28, in <module> llm = ChatOpenAI( File "/home/user/.local/lib/python3.10/site-packages/langchain_core/_api/deprecation.py", line 180, in warn_if_direct_instance return wrapped(self, *args, **kwargs) File "/home/user/.local/lib/python3.10/site-packages/langchain_core/load/serializable.py", line 107, in __init__ super().__init__(**kwargs) File "pydantic/main.py", line 341, in pydantic.main.BaseModel.__init__ pydantic.error_wrappers.ValidationError: 1 validation error for ChatOpenAI __root__ 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)

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