Update app.py

app.py

@@ -11,7 +11,7 @@ from dotenv import load_dotenv
 from PyPDF2 import PdfReader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.document_loaders import UnstructuredPDFLoader
-from llama_index.embeddings import HuggingFaceEmbedding
+from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.vectorstores import Chroma
 from langchain.chat_models import ChatOpenAI
 from langchain.memory import ConversationBufferMemory