Changed the document name

app.py

@@ -5,7 +5,7 @@ from langchain.chains.question_answering import load_qa_chain
 from langchain.llms import OpenAI
 import os
 
-with open("guide1.txt") as f:
+with open("Data_Engineering.txt") as f:
     hitchhikersguide = f.read()
 
 text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0, separator = "\n")