Update app.py

app.py

@@ -130,4 +130,7 @@ async def main(message: cl.Message):
         except Exception as e:
             import traceback
             error_msg = f"An error occurred: {str(e)}\n{traceback.format_exc()}"
-            await msg.update(content=error_msg)
+            await msg.update(content=error_msg)
+
+if __name__ '__main__':
+    cl.start()