Update app.py

app.py

@@ -35,7 +35,7 @@ from langchain.docstore.document import Document
 from langchain.vectorstores import Chroma
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 
-from langchain.chains import VectorDBQA, ConversationChain
+from langchain.chains import VectorDBQA, ConversationChain, ConversationalRetrievalChain
 
 from langchain.document_loaders import UnstructuredFileLoader, TextLoader
 from langchain import PromptTemplate
@@ -242,7 +242,7 @@ def getRAGChain(customerName, customerDistrict, custDetailsPresent, vectordb,llm
     #         "memory": memory
     #     }
     # )
-    chain = ConversationChain(
+    chain = ConversationalRetrievalChain.from_llm(
         llm=getLLMModel(llmID),
         chain_type='stuff',
         retriever=getRetriever(vectordb),