Update app.py

app.py

@@ -29,7 +29,9 @@ async def save_messages(ctx, channel_id: int):
         await ctx.send("Channel not found.")
         return
 
-    messages = await channel.history(limit=None).flatten()
+    messages = []
+    async for message in channel.history(limit=None):
+        messages.append(message)
 
     with open("gradio-questions.json", 'w', encoding='utf-8') as file:
         for message in messages: