Update app.py

app.py

@@ -97,7 +97,7 @@ async def on_chat_start():
 
     # Create a chain that uses the Chroma vector store
     chain = ConversationalRetrievalChain.from_llm(
-        Fireworks(model="accounts/fireworks/models/llama-v2-13b-chat", model_kwargs={"temperature":0, "max_tokens":1500, "top_p":1.0}, streaming=True),
+        ChatFireworks(model="accounts/fireworks/models/llama-v2-13b-chat", model_kwargs={"temperature":0, "max_tokens":1500, "top_p":1.0}, streaming=True),
         chain_type="stuff",
         retriever=docsearch.as_retriever(),
         memory=memory,