Update app.py

app.py

@@ -3,10 +3,10 @@ from langchain_community.chat_message_histories import Neo4jChatMessageHistory
 from langchain_core.runnables.history import RunnableWithMessageHistory
 from langchain.prompts import ChatPromptTemplate
 from langchain.schema import StrOutputParser
-from langchain_community.graphs import Neo4jGraph
 from langchain_huggingface import HuggingFaceEmbeddings
 from langchain_core.prompts.chat import MessagesPlaceholder
-from langchain.vectorstores import Neo4jVector
+from langchain_community.vectorstores import Neo4jVector
+from langchain_neo4j import Neo4jGraph
 from langchain_google_genai import ChatGoogleGenerativeAI
 from uuid import uuid4
 import os