Traceback:
File "C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\streamlit\runtime\scriptrunner\script_runner.py", line 565, in _run_script
exec(code, module.dict)
File "C:\Users\user\Desktop\pyscripttest\PDFGPT\gpt_chatwithPDF\gpt_cust_kb.py", line 95, in
query_index(query_u=user_input)
File "C:\Users\user\Desktop\pyscripttest\PDFGPT\gpt_chatwithPDF\gpt_cust_kb.py", line 39, in query_index
storage_context = StorageContext.from_defaults(persist_dir=f"{PATH_TO_INDEXES}/{pdf_to_use}")
File "C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\llama_index\storage\storage_context.py", line 58, in from_defaults
docstore = docstore or SimpleDocumentStore.from_persist_dir(persist_dir)
File "C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\llama_index\storage\docstore\simple_docstore.py", line 48, in from_persist_dir
return cls.from_persist_path(persist_path, namespace=namespace)
File "C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\llama_index\storage\docstore\simple_docstore.py", line 64, in from_persist_path
simple_kvstore = SimpleKVStore.from_persist_path(persist_path)
File "C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\llama_index\storage\kvstore\simple_kvstore.py", line 69, in from_persist_path
raise ValueError(f"No existing {name} found at {persist_path}.")

ImportError: cannot import name 'download_loader' from 'llama_index' (unknown location)
Traceback:
File "C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\streamlit\runtime\scriptrunner\script_runner.py", line 565, in _run_script
exec(code, module.dict)
File "C:\Users\user\Desktop\pyscripttest\PDFGPT\gpt_chatwithPDF\gpt_cust_kb.py", line 1, in
from llama_index import download_loader, SimpleDirectoryReader, ServiceContext, LLMPredictor, GPTVectorStoreIndex, PromptHelper, StorageContext, load_index_from_storage

Managed to fix this error by changing
manual_names = os.listdir('C/gpt_indexes')

To:
manual_names = os.listdir('C:/gpt_indexes')

got segment fault when running:

python -m streamlit run agentic_rag.py

  You can now view your Streamlit app in your browser.

  Local URL: http://localhost:8501
  Network URL: http://192.168.1.155:8501

  For better performance, install the Watchdog module:

  $ xcode-select --install
  $ pip install watchdog

zsh: segmentation fault  python -m streamlit run agentic_rag.py

How do you add system messages to the API code ?