Facebook API error subcode 33
Check you access token at https://developers.facebook.com/tools/debug/accesstoken
Your app might be missing a needed permission scope.
I have had this issue a few times and the error led me to spend an hour or two combing the docs. The real issue for me each time has been malformed json in the request body (I'm using curl). Dumb I know, but in case a poor soul comes across this. Be sure to validate your json before you decide you query is wrong.