Does API GetSinglePost still work? I have checked many time but it’s always give me “error”: “That record does not exist.”

HTTP/1.1 404 NOT FOUND
Cache-Control: private, no-store, must-revalidate
Connection: keep-alive
Content-Disposition: attachment; filename=unknown_file.json
Content-Length: 83
Content-Type: application/json
Date: Fri, 07 Aug 2015 17:56:45 GMT
Expires: 0
Pragma: no-cache
Server: Mashape/5.0.6
Strict-Transport-Security: max-age=631138519

{
“code”: 900,
“data”: “”,
“success”: false,
“error”: “That record does not exist.”
}

Give me some help, please. Thanks