awsUserPool?.signUp(username, password: password,
                        userAttributes: attributes,
                        validationData: nil).continueWith
{
    DispatchQueue.main.async(execute: {
        if let error = task.error as NSError? {
            print("Error: (error.userInfo["message"] as? String)")
        } else if let result = task.result  {
            ..........
        }
    })
    return nil
}

Error: Optional("Unable to verify secret hash for client 7xyyabcdefgh#########")

Error: Optional("App client ab12######### is not configured
for secret but secret hash was received")