Error vk_api.exceptions.ApiError: [100] One of the parameters specified was missing or invalid: peer_id not integer. How to solve it?

Question

Python

I recently started learning python. I decided to write a bot, as planned, it should send pictures from a computer. Here is the code:

def main():
    for event in longpoll.listen():
        if event.type == VkEventType.MESSAGE_NEW:
            if event.to_me:
                request = event.text.lower()
                if request == '1':

                    a = vk.method("photos.getMessagesUploadServer")
                    b = requests.post(a['upload_url'], files={'photo': open('C:\data_for_bot\Bar.jpg', 'rb')}).json()
                    c = vk.method('photos.saveMessagesPhoto',{'photo': b['photo'], 'server': b['server'], 'hash': b['hash']})[0]
                    d = "photo{}_{}".format(c["owner_id"], c["id"])
                    vk.method("messages.send", {"peer_id": id, "message": "Bar", "attachment": d, "random_id": 0})

only at the end gives an error
vk_api.exceptions.ApiError: [100] One of the parameters specified was missing or invalid: peer_id not integer
What should I do and how to fix it?
Thanks in advance.