Update app.py

app.py

@@ -201,11 +201,11 @@ class AcademicResearchAssistant:
                     st.session_state.chat_history.append(("User", user_input))
                 else:
                     st.session_state.chat_history.append(
-                        ("Bot", "I couldn't find relevant papers for your query. Please try rephrasing or use more specific terms.")
+                        ("Bot", ["I couldn't find relevant papers for your query. Please try rephrasing or use more specific terms."])
                     )
             except Exception as e:
                 st.session_state.chat_history.append(
-                    ("Bot", f"An error occurred while processing your request: {str(e)}")
+                    ("Bot", [f"An error occurred while processing your request: {str(e)}"])
                 )
                 st.error("There was an error processing your request. Please try again.")