Update app.py

app.py

@@ -169,6 +169,6 @@ if prompt := st.chat_input(f"Hi I'm {selected_model}, ask me a question"):
 
     st.session_state.messages.append({"role": "assistant", "content": response})
 
-if len(session_state.messages)>0:
+if len(st.session_state.messages)>0:
     st.button("retry", key="retryButton", on_click=retry_click)
     st.button("remove", key="removeButton", on_click=remove_click)