Xcode - Recevier type 'BFTask' for instance message is forward declaration

I was posted this question earlier. But i didn't get what i want. Now Im trying to use Parse and instead of saving it locally using Realm, I will be using CoreData or Sqlite. But my problem is in BFTask. I read their documentation in regards with saving the data locally using sqlite.

PFQuery *query = [PFQuery queryWithClassName:@"GameScore"];
[query fromLocalDatastore];
[[query getObjectInBackgroundWithId:@"xWMyZ4YEGZ"] continueWithBlock:^id(BFTask *task) {
  if (task.error) {
    // something went wrong;
    return task;
  }

  // task.result will be your game score
  return task;
}];

But I'm having an error on the BFTask Part. It says Recevier type 'BFTask' for instance message is forward declaration

How can i fix this? I was also searching through the internet regarding this. I already added the CoreData.framework to my project (of course) and also the #import <CoreData/CoreData.h> to my .pch file. and also in my .h and .m file but i still got the error. Please help me!

Thanks! More power!