Please what’s the meaning of this I got while running a code in command line

Question

{
"error": {
"message": "(#803) Some of the aliases you requested do not exist: v3.0{user-id}",
"type": "OAuthException",
"code": 803,
"fbtrace_id": "Ag5NhMVkUezSbVkQX6D7Qjs"
}
}

Answer 1

I can't even understand whether it is the C++ question(you mentioned the C++ tag) or related to web development?

Answer 2

probably an error in generating the fb api url

Answer 3

It's definitely an error to do with the request you're making to the API. The type is "OAuthException" which means it could be something to do with your API key. Have you checked it's valid?

It does also say {user-id}. That could refer to something like an API key or it could be a resource you're trying to request which is non-existent.