posts in group feed have unavailable content - facebook

Question

I am an admin of a private group in facebook and I would like to use facebook API to scrap all group posts.
I used graph api explorer to generate an access token with read_stream, friends_group and user_groups permissions.
When I access the group post with https://graph.facebook.com/GROUP_ID/feed?access_token=TOKEN I get a data array with each post but the caption element has the value
"Attachment UnavailableThis attachment may have been removed or the person who shared it may not have permission to share it with you." and all the other fields such as link, message, etc ... are not present.
If I open the facebook group using the browser I can see all posts.
Am I missing something here ?

Answer 1

This issue appears to have been corrected. I can access all the Group content for my private group as long as I have a valid Auth Token.

Answer 2

Below is the code where I fetch the posts of a group in a JSON Object. This JSON object contains a JSON Array of "data".
This further contains a separate JSON array for messages (or status of the post).
GraphRequest.newGraphPathRequest(
accessToken, "/id/posts",
new GraphRequest.Callback() {
#Override
public void onCompleted(GraphResponse graphResponse) {
try {
graphResponse.getRawResponse();
m=graphResponse.getJSONObject();
JSONArray n=m.getJSONArray("data");
messages=new String[n.length()];
for(int i=0;i<n.length();i++) {
JSONObject a = n.getJSONObject(i);
messages[i]=a.optString("message");
}
list.setAdapter(new ArrayAdapter<String> (fb.this,android.R.layout.simple_list_item_1,messages));
} catch (Exception e) {
Toast.makeText(fb.this, "error is: " + e.toString(), Toast.LENGTH_LONG).show();
}
}
}).executeAsync();