So I\'m using the following endpoint from facebook graph-api to get a specific post data:
https://graph.facebook.com/v2.2/{post-id}?access_token=XXX
However,
You can view an answer on this page -> Unusual behavior of facebook grap API ("type": "GraphMethodException", "code": 100)
This isn't a bug, the error means that the data you're trying to access is not accessible to you, does not exist, has been deleted, is not available because you haven't provided an access token from a user who can see it, etc.
See this answer for an example of this error message in relation to Facebook pages: https://stackoverflow.com/a/6847088/21062 - the same is true when trying to access user profiles if that user has blocked you, blocked your app, disabled their account or disabled all apps from accessing their information.