Why the output is empty?

[pinkyyy333]

Hi, I am a complete novice in coding.
And here is my output
There aren't any context
Initially, when I run ' python query_data.py "How does Alice meet the Mad Hatter?" '
the output is "Unable to find matching results."
So I delect this

if len(results) == 0 or results[0][1] < 0.7:
    print(f"Unable to find matching results.")
    return

then I run ' python query_data.py "How does Alice meet the Mad Hatter?" '

PS C:\langchain-rag-tutorial-main> python create_database.py
Split 1 documents into 801 chunks.
So she was considering in her own mind (as well as she could, for the
hot day made her feel very sleepy and stupid), whether the pleasure of
making a daisy-chain would be worth the trouble of getting up and
picking the daisies, when suddenly a White Rabbit with pink eyes ran
close by her.
{'source': 'data\\books\\alice_in_wonderland.md', 'start_index': 1654}
PS C:\langchain-rag-tutorial-main> python query_data.py "How does Alice meet the Mad Hatter?"
Human: 
Answer the question based only on the following context:



---

Answer the question based on the above context: How does Alice meet the Mad Hatter?

C:\langchain-rag-tutorial-main\query_data.py:51: LangChainDeprecationWarning: The method `BaseChatModel.predict` was deprecated in langchain-core 0.1.7 and will be removed in 1.0. Use invoke instead.
  response_text = model.predict(prompt)
Response: Alice meets the Mad Hatter at a tea party in Wonderland.
Sources: []
PS C:\langchain-rag-tutorial-main>