updated imports

app.py

@@ -10,7 +10,9 @@ from typing import Optional
 from pathlib import Path
 from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_community.vectorstores import Chroma
-from langchain.document_loaders import DataFrameLoader, PyPDFLoader, CSVLoader
+from langchain.document_loaders.csv_loader import CSVLoader
+from langchain.document_loaders.pdf_loader import PyPDFLoader
+from langchain.document_loaders.dataframe import DataFrameLoader
 from langchain.text_splitter import CharacterTextSplitter
 from huggingface_hub import HfApi