Update app.py

app.py

@@ -1,7 +1,7 @@
 import gradio as gr
 from langchain_community.llms import HuggingFaceHub
 from langchain_community.vectorstores import Chroma
-from langchain.document_loaders import PyPDFLoader
+from langchain_community.document_loaders import PyPDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_core.output_parsers import StrOutputParser
 from langchain_huggingface import HuggingFaceEmbeddings