How do you resolve this error when you pickle a LangChain VectorStoreIndexCreator object?

I want to pickle/save my VectorStore index in LangChain. Below is my code:

import pickle from langchain.document_loaders import PyPDFLoader from langchain.indexes import VectorstoreIndexCreator # Load the PDF file pdf_path = "Los Angeles County, CA Code of Ordinances.pdf" loader = PyPDFLoader(pdf_path) # Create the index index = VectorstoreIndexCreator().from_loaders([loader]) # Serialize and save the loader and index objects with open("data.pickle", "wb") as f: pickle.dump((loader, index), f) # To load the objects from the file: with open("data.pickle", "rb") as f: loader, index = pickle.load(f) 

but when I run it I get this error:

~/LangChain-exploredoc-explore$ python pickle_file.py Using embedded DuckDB without persistence: data will be transient Traceback (most recent call last): File "/home/runner/LangChain-exploredoc-explore/pickle_file.py", line 14, in <module> pickle.dump((index), f) TypeError: cannot pickle 'duckdb.DuckDBPyConnection' object 

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