run crashed:fatal error: unexpectedly found nil while unwrapping an Optional value

[gclsoft]

lazy var dataDirectory: NSURL = {
    // The directory the application uses to store the Core Data store file. This code uses a directory named "com.LexTang.VPNOn" in the application's documents Application Support directory.
        return NSFileManager.defaultManager().containerURLForSecurityApplicationGroupIdentifier(kAppGroupIdentifier)!// at this line!!!
    }()

[lexrus]

Have you turn on the App Groups in capabilities for both target?