AVaudioplayer not loading an existing and playable file swift - ios

Question

I run into a problem creating a module that records voice and plays the result. The problem is that if a record and play it works but if a record and later I get the file created before and try to play I get the: Error Domain=NSOSStatusErrorDomain Code=1685348671 "(null)"
103: OpenFromDataSource failed
78: Open failed
here's a simplified version of the code I'm using:
var soundRecorder : AVAudioRecorder!
var SoundPlayer : AVAudioPlayer!
var recordingSession: AVAudioSession!
func getFileURL() -> URL {
let record = getDocumentsDirectory().appendingPathComponent(fileName)
return record
}
func getDocumentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
return paths[0]
}
override func viewDidLoad() {
super.viewDidLoad()
setupRecorder()
displaylinkRecording()
}
func setupRecorder(){
let recordSettings = [
AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVSampleRateKey: 44100,
AVNumberOfChannelsKey: 2,
AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue
]
do {
try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord)
soundRecorder = try AVAudioRecorder(url: getFileURL(), settings: recordSettings)
soundRecorder.delegate = self
soundRecorder.isMeteringEnabled = true
soundRecorder.prepareToRecord()
} catch {
print("error recording")
}
}
I'm updating the file name from a different ViewController:
func UpdateNameFile() {
fileName = reg.idEvent + ".m4a"
setupRecorder()
}
And the corresponding record and play functions:
#IBAction func Recording(_ sender: UIBarButtonItem) {
soundRecorder.record()
displaylinkRecording()
}
#IBAction func PlayButton(_ sender: UIBarButtonItem) {
preparePlayer()
SoundPlayer.play()
displaylinkPlaying()
}
func preparePlayer(){
do {
try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord)
SoundPlayer = try AudioPlayer(contentsOf: getFileURL() as URL)
SoundPlayer.delegate = self
SoundPlayer.isMeteringEnabled = true
SoundPlayer.prepareToPlay()
SoundPlayer.volume = 1.0
} catch {
print(error)
}
}
so in other words, if I try to record and play, works, but if I try to play getting a file that I know is in the directory and was created before, doesn't work. And I cannot see why...
Any advice?