RFID 8500 ios swift

im trying use Zebra rfid 8500 SDK for ios in swift but i have this problem.

 

var active_readers = [NSMutableArray]()

let result2:SRFID_RESULT = (self.apiInstance?.srfidGetAvailableReadersList(active_readers) as? AutoreleasingUnsafeMutablePointer)!

 

SRFID_RESULT alwais is SRFID_RESULT_INVALID_PARAMS

 

and swift change my variable NSMutableArray to AutoreleasingUnsafeMutablePointer<NSMutableArray>?

 

someone have an idea or solution how can solve this ??