I have the unban function in my disnake bot. After I unban, the bot should send a personal message to the user, but I got an error there.

Code:

@bot.slash_command(name="unban",
                  description="Разбан пользователя (указание причины обязательно)"
                  )
@commands.has_permissions(ban_members=True)
async def unban(inter, member_id: str, reason: str):
    user = await bot.get_or_fetch_user(int(member_id))
    await inter.response.send_message(f'{user.mention} разбанен по причине: "{reason}".')
    await bot.guilds[0].unban(user, reason = reason)
    ban_list_channel = bot.get_channel(1274693427811844157)
    notification_channel = bot.get_channel(1274130140489580584)

    unban_embed = disnake.Embed(title = 'Пользователь разбанен!',
                              description = f'{user.mention} разбанен на сервере.n{ban_list_channel.mention} обновлен.',
                              color = disnake.Colour.yellow(),
                              timestamp= datetime.now()
                              )

    unban_embed_for_user = disnake.Embed(title = 'Вы были разбанены!',
                              description = f'{user.mention} разбанен на сервере {bot.guilds[0].name}.nПричина: "{reason}"nПриглашаем вас: https://discord.gg/hwQM6GG4kB',
                              color = disnake.Colour.green(),
                              timestamp= datetime.now()
                              )

    lines = []

    with open('source/txt/ban_list.txt', 'r') as ban_list:
            line = ban_list.readline()
            if str(member_id) not in line:
                lines.append(line)
            while line:
                line = ban_list.readline()
                if str(member_id) not in line:
                    lines.append(line)

    with open('source/txt/ban_list.txt', 'r+') as ban_list:
        ban_list.truncate()
        for line in lines:
            ban_list.write(line)
        text = ban_list.read()

    await notification_channel.send(embed = unban_embed)
    await ban_list_channel.purge(limit=3)

    ban_list_embed = disnake.Embed(title = 'Список забаненных пользователей:',
                              description = text,
                              color = disnake.Colour.red(),
                              timestamp= datetime.now()
                              )

    await ban_list_channel.send(embed = ban_list_embed)

    await asyncio.sleep(3)
    await inter.delete_original_message()
    await user.send(embed = unban_embed_for_user)

This is the error:

Ignoring exception in slash command 'unban':
Traceback (most recent call last):
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakeextcommandsslash_core.py", line 728, in invoke
    await call_param_func(self.callback, inter, self.cog, **kwargs)
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakeextcommandsparams.py", line 1083, in call_param_func
    return await maybe_coroutine(safe_call, function, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakeutils.py", line 567, in maybe_coroutine
    return await value
           ^^^^^^^^^^^
  File "D:ds_bottrader.py", line 172, in unban
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakeabc.py", line 1748, in send
    data = await state.http.send_message(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakehttp.py", line 409, in request
    raise Forbidden(response, data)
disnake.errors.Forbidden: 403 Forbidden (error code: 50007): Cannot send messages to this user

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

Traceback (most recent call last):
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakeextcommandsinteraction_bot_base.py", line 1378, in process_application_commands
    await app_command.invoke(interaction)
  File "C:UsersIcoldAppDataLocalProgramsPythonPython311Libsite-packagesdisnakeextcommandsslash_core.py", line 737, in invoke
    raise CommandInvokeError(exc) from exc
disnake.ext.commands.errors.CommandInvokeError: Command raised an exception: Forbidden: 403 Forbidden (error code: 50007): Cannot send messages to this user

I tried to add a sleep function because I thought that the response from the server wasn’t delivered yet, but this thought is wrong.