Swift throws compilation error on Fetching objects in file other than AppDelgate and accessing element in NSOrderedSet

I have a CoreDataManager.Swift where I delegated the creation of PersistentStore Coordinator, ManagedObjectContext and NSManagedObjectModel

I have the following function where Entity is a NSManagedObject and timeStamps is NSOrderedSet. In data model timeStamps is one to many relationship to another NSManagedObject TimeStamp

func fetchData(){
    let fetchRequest = NSFetchRequest(entityName:"Entity")

    var error: NSError?

    let fetchedResults =
    CoreDataManager.sharedInstance.managedObjectContext!.executeFetchRequest(fetchRequest,
        error: &error) as! [NSManagedObject]?

    //If error then return...

    for entity in fetchedResults as! [Entity]
    {
        println(entity.name)
        println(entity.timeStamps)
        for eS in entity.timeStamps
        {
            println(eS.time) //OK in AppDelegate but throw compilation error in CoreDataManager.swift
        // Error thrown is AnyObject does not have a member name time
        //If I force to TimeStamp then the fault on timeStamps is not fired.


        }
    }
}

The issues is, it works fine if I have that function in AppDelegate but throws compilation errors in CoreDataManager. If I try to force it as TimeStamp then the fault on timeStamps is not fired.

Thanks for any help