anchor.diff:          }
         });
         if (fileSyncImmediately) {
  -        PinUtility.writeJsonFile(CartConst.DB_TAGS_PATH, tags)
  -          .then((_) => PinUtility.writeJsonFile(CartConst.DB_POSTS_PATH, posts))
  -          .then((_) => completer.complete(null));
  +        Future.wait([
  +            PinUtility.writeJsonFile(CartConst.DB_TAGS_PATH, tags),
  +            PinUtility.writeJsonFile(CartConst.DB_POSTS_PATH, posts)
  +        ]).then((_) => completer.complete(null));
         }
       } else {
         completer.complete(null);
  
positive.code:       });
        Future.wait(postRemoveList).then((_) {
          if (fileSyncImmediately) {
            PinUtility.writeJsonFile(CartConst.DB_CATEGORIES_PATH, tags)
            .then((_) => PinUtility.writeJsonFile(CartConst.DB_POSTS_PATH, posts))
            .then((_) => completer.complete(null));
          } else {
            completer.complete(null);
          }
  
negative.code:     tagPosts[uuid].add(postUuid);
    }
  
    //-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
    //-* UTIL: GOOGLE DRIVER
    //-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
  
  }