Update app.py

app.py

@@ -63,7 +63,7 @@ def chatresponse(message, history):
     
     from langchain_core.runnables import RunnablePassthrough
     rag_chain = (
-    {"context": retriever, "question": RunnablePassthrough()}
+    {"context": history, "question": RunnablePassthrough()}
     | prompt
     | llm
     | StrOutputParser()