[BUG] Followed the docs, does not work as expected, used both anthropic API and openAI API key

[eff-kay]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. did pip install
2. ran sage-chat hugging-face/transformers
3. gradio runs, but upon first questions. returns an error.

I asusmed this is because indexing is not done

performed index, still not working.

Expected behavior
Chat to work

Screenshots
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Setup (please complete the following information):

• Python version: 3.11
• OS: 13.66

LOGS

  File "/Users/faizank/workspace/experiments/sage/venv/lib/python3.11/site-packages/gradio/utils.py", line 691, in async_iteration
    return await anext(iterator)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/faizank/workspace/experiments/sage/sage/chat.py", line 105, in _predict
    sources = [(doc.metadata["file_path"], doc.metadata["url"]) for doc in event["data"]["output"]]
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not iterable
ERROR:asyncio:Task exception was never retrieved
future: <Task finished name='Task-174' coro=<<async_generator_athrow without __name__>()> exception=BadRequestError("Error code: 400 - {'type': 'error', 'error': {'type': 'invalid_request_error', 'message': 'system.0: Input does not match the expected shape.'}}")>
Traceback (most recent call last):