Update app.py

app.py

@@ -4,7 +4,7 @@ from langchain_community.document_loaders import WebBaseLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
 # from langchain_openai import OpenAIEmbeddings, ChatOpenAI
-from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+from langchain_core.prompts.chat import ChatPromptTemplate, MessagesPlaceholder
 from langchain.chains import create_history_aware_retriever, create_retrieval_chain
 from langchain.chains.combine_documents import create_stuff_documents_chain
 from langchain_community.embeddings import HuggingFaceBgeEmbeddings