Update app_utils.py

app_utils.py

@@ -14,6 +14,7 @@ from langchain.vectorstores import Chroma # Chroma is a class in the langchain.v
 from langchain.document_loaders import DirectoryLoader #       
 from langchain.embeddings.openai import OpenAIEmbeddings # OpenAIGPTEmbeddings
 from langchain.text_splitter import CharacterTextSplitter #     CharacterTextSplitter is a class in the langchain.text_splitter module that can be used to split text into chunks.
+import streamlit as st
 from tenacity import (
     retry,
     stop_after_attempt,