NSURLCredential cant compile in Swift -

I have some compilation problems with the latest XCode 6.1 (6A1046a)

this line will be compiled:

  var newCredential = NSURLCredential (user: "test", password: "test", firmly NSURLCredentialPersistence.None);   
 But it throws an "extra logic" identity into the call:  
  var identity: SecIdentity = self.getClientCertificate (); Var newCredential2 = NSURLCredential (Identity: Identity, Certificate: Zero, Persistence: NSURLCredentialPersistence.None);   
 But I do not know why it should work according to the manual:  
 Any thoughts?  
 
 Error swift that you are misleading (a common issue if a function is incorrectly Is one of the passing arguments). The problem is that the  certificate  is defined as  [AnyObject] , but you are passing it to  zero . Since  certificate  is not an option, it can not take any  zero  value. The documentation also says:  
 
  One or more of the  certificate for identity certificates of SecCertificateRef object.   
 So, you must pass an array of at least one certificate to it.