FBSDKGraphRequest cannot post image and text anymore (no more text)

I'm posting to a group user wall, (image and text). It have worked from a long time, and stop working recently(now, image are posted, but no text :( ). Any idea if there was a new way or rules? (no error reported)

    [params setObject:sContent forKey:@"message"];
    [params setObject:yourImageData forKey:@"picture"];



    [[[FBSDKGraphRequest alloc]
      initWithGraphPath:@"xxxxxxxxxxxxxxx/photos"
      parameters: params
      HTTPMethod:@"POST"]
     startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
         if (!error) {