VK removeChatUser what is wrong?

Question

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Where is the mistake?

for event in longpoll.listen():
  if event.type == VkBotEventType.MESSAGE_NEW:
    if event.from_chat:

      id = event.chat_id
      msg = event.object.message['text'].lower()
                       #Забанить пользователя
      if msg == "/бан":
        vk_session.method("messages.removeChatUser", {"chat_id": event.object.peer_id - 2000000000,"member_id": event.obj.reply_message['from_id']})

File "E:\Python\bot_vk\Shtsirlits.py", line 60, in
vk_session.method("messages.removeChatUser", {"chat_id": event.object.peer_id - 2000000000,"member_id": event.obj.reply_message ['from_id']})
TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'