如何解决Nextcord的ApplicationInvokeError及Unknown interaction错误？

我在用VSCode搭配Nextcord开发Python Discord机器人，运行一段时间后抛出如下错误：

Ignoring exception in command <nextcord.application_command.SlashApplicationCommand object at 0x000002379C4C7730>:
Traceback (most recent call last):
  File "C:\Users\jonat\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\nextcord\application_command.py", line 863, in invoke_callback_with_hooks
    await self(interaction, *args, **kwargs)
  File "C:\Users\jonat\OneDrive\Documents\DiscordBot\main.py", line 53, in arem
    await interaction.response.send_message("||**Cal Jordan:** Instant message from... AREM!!||", files=[nextcord.File('AREM.mp3')])
  File "C:\Users\jonat\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\nextcord\interactions.py", line 895, in send_message
    await adapter.create_interaction_response(
  File "C:\Users\jonat\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\nextcord\webhook\async_.py", line 204, in request
    raise NotFound(response, data)
nextcord.errors.NotFound: 404 Not Found (error code: 10062): Unknown interaction

The above exception was the direct cause of the following exception:

nextcord.errors.ApplicationInvokeError: Command raised an exception: NotFound: 404 Not Found (error code: 10062): Unknown interaction

错误原因及解决办法 #

• 核心原因：Discord要求交互响应必须在3秒内完成，发送带文件的消息时，文件读取、网络传输等操作可能超时，导致Discord判定交互已失效，后续响应就会返回Unknown Interaction错误。
• 具体修复步骤：
  1. 先发送延迟响应：在执行任何耗时操作前，调用await interaction.response.defer()，告知Discord将延迟回复，这会把响应时限延长至15分钟。
  2. 用followup发送内容：延迟响应后，使用await interaction.followup.send()替代interaction.response.send_message()来发送带文件的消息。
  3. 提前加载文件：如果AREM.mp3文件较大，建议在机器人启动时就将文件加载到内存，避免每次命令执行时重复读取磁盘，减少耗时：

     import io
     from nextcord import File
     
     # 机器人启动时全局加载文件
     arem_file = None
     with open('AREM.mp3', 'rb') as f:
         arem_file = io.BytesIO(f.read())
     arem_file.seek(0)  # 重置文件指针到开头
     
     # 命令函数中使用
     async def arem(interaction):
         await interaction.response.defer()
         await interaction.followup.send("||**Cal Jordan:** Instant message from... AREM!!||", files=[File(arem_file, filename='AREM.mp3')])
     

  4. 检查网络稳定性：确保机器人所在服务器网络稳定，避免因网络波动导致响应超时。

内容的提问来源于stack exchange，提问作者Jonathan Steury