unexpectedly found nil while unwrapping an Optional value

[Ged2323]

This code works the first time though when I run it a second time on the line:

• result.name = "(result.name! ) ClientChange" I get the error
  (unexpectedly found nil while unwrapping an Optional value)

let moc = CoreDataStack.defaultStack.managedObjectContext

    let task: Task = NSEntityDescription.insertNewObjectForEntityForName("Task", inManagedObjectContext: moc) as! Task
    task.name = "HElaLuia"

    let cycling: Task = NSEntityDescription.insertNewObjectForEntityForName("Task", inManagedObjectContext: moc) as! Task
    cycling.name = "Foolish"

    let biking: Task = NSEntityDescription.insertNewObjectForEntityForName("Task", inManagedObjectContext: moc) as! Task
    biking.name = "Acting"

    let outdoorTasksTag = NSEntityDescription.insertNewObjectForEntityForName("Tag", inManagedObjectContext: moc) as! Tag
    outdoorTasksTag.name = "AnotherTag"

    let newTasksTag = NSEntityDescription.insertNewObjectForEntityForName("Tag", inManagedObjectContext: moc) as! Tag
    newTasksTag.name = "Just Another Tag"
    newTasksTag.task = biking

    outdoorTasksTag.task = cycling


    if moc.hasChanges
    {
        do
        {
            try moc.save()
        }
        catch let error as NSError?
        {
            print("Error Occured \(error!)", terminator: "\n")
        }
    }
    CoreDataStack.defaultStack.seamStore!.triggerSync()



            do
            {
                try moc.save()
            }
            catch
            {
                print("Error thrown baby", terminator: "\n")
            }



            let fetchRequest: NSFetchRequest = NSFetchRequest(entityName: "Task")
            do
            {
                let results = try moc.executeFetchRequest(fetchRequest)
                for result in results as! [Task]
                {


                    result.name = "\(result.name! ) ClientChange"
                    NSLog ("result.name  %@ \n",result);
                }
                try moc.save()
            }
            catch
            {

            }

Also can you give a demo of how to use the cloudKit functionality.
Thank you in Advance. :)