Can someone explain to me where their logic is?

Question

In contact with

Drop dead. What to do? Write to the bugtracker?
I used it like this (spaces so that the link is not cut off):
http s: //api.vk.com/method/messages.send?user_id=XXXXXXXX&access_token=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX&attachment=photoXXXXXX_XXXXXXX

{
    "error": {
        "error_code": 100,
        "error_msg": "One of the parameters specified was missing or invalid: message is empty or invalid",
        "request_params": [{
            "key": "oauth",
            "value": "1"
        }, {
            "key": "method",
            "value": "messages.send"
        }, {
            "key": "user_id",
            "value": "ThereWasMyId"
        }, {
            "key": "attachment",
            "value": "photoXXXXXXX_XXXXXXX"
        }]
    }
}

Let's proceed here :
... message - the text of a personal message. Required if attachment is not set.
string ...
... attachment - media attachments to the personal message, separated by commas ... The parameter is required if the message parameter is not specified. ...

Answer 1

And I know what the problem is. You wrote attachment, but you need attachments. I'm almost as wrong now.

Answer 2

Due to the abundance of information provided, let's tell fortunes on coffee grounds:

1. attachment alive? An error in its id makes it invalid, and the message will not leave without an attachment and without a message.
   
2. does the attachment belong to the sender? If not, then you need to add access_key - in the same place, in the documentation at your link.
   
3. API version? random_id you specify?
   

Answer 3

I think you can send message with an empty value. Mb will work