Update app.py

app.py

@@ -110,7 +110,7 @@ async def main(message: cl.Message):
         logger.info("Message processed successfully")
     except KeyError as e:
         logger.error(f"Session error: {e}")
-        await cl.Message(content="An error occurred. Please restart the chat.").send()
+        await cl.Message(content="Session is disconnected. Please restart the chat.").send()
     except Exception as e:
         logger.error(f"Unexpected error: {e}")
         await cl.Message(content="An unexpected error occurred. Please try again.").send()