runtime error

2023-07-21 10:18:32.581 Warning: to view this Streamlit app on a browser, run it with the following command: streamlit run app.py [ARGUMENTS] Traceback (most recent call last): File "/home/user/app/app.py", line 24, in <module> main() File "/home/user/app/app.py", line 17, in main agent = create_pandas_dataframe_agent(OpenAI(temperature=0), df, verbose=True) File "pydantic/main.py", line 341, in pydantic.main.BaseModel.__init__ pydantic.error_wrappers.ValidationError: 1 validation error for OpenAI __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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