Update app.py

app.py

@@ -21,7 +21,7 @@ from langchain.embeddings import OpenAIEmbeddings
 from langchain.prompts import PromptTemplate, ChatPromptTemplate
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 
-from langchain_community.vectorstores import MongoDBAtlasVectorSearch, Weaviate
+from langchain.vectorstores import MongoDBAtlasVectorSearch, Weaviate
 
 from langchain_core.messages import HumanMessage, SystemMessage
 from langchain_core.output_parsers import StrOutputParser