AVCaptureDeviceInput initialization exception - ios

Question

When I try to create an instance of type AVCaptureDeviceInput I get the following error.
What have I done so far:
1) I have gain permissions for camera use and microphone.
2) I have tested the code on an iPhone 7 and an iPhone 5s.
3) When it displays the error I printed of the value of session.isRunning and it returns true value.
4) All the properties are retain strong.
Error Domain=AVFoundationErrorDomain Code=-11814 "Cannot Record" UserInfo={NSLocalizedDescription=Cannot Record, NSLocalizedRecoverySuggestion=Try recording again.
This is the code:
let session = AVCaptureSession()
self.session = session
session.sessionPreset = AVCaptureSessionPresetPhoto
do {
let input = try AVCaptureDeviceInput(device: device)
session.addInput(input)
if session.canAddInput(input) {
let stillImageOutput = AVCapturePhotoOutput()
self.stillImageOutput = stillImageOutput
let settings = AVCapturePhotoSettings()
stillImageOutput.capturePhoto(with: settings, delegate: self)
if session.canAddOutput(stillImageOutput) {
session.addOutput(stillImageOutput)
if let previewLayer = AVCaptureVideoPreviewLayer(session: session) {
self.previewLayer = previewLayer
previewLayer.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer.connection!.videoOrientation = AVCaptureVideoOrientation.portrait
viewController.centerView.layer.insertSublayer(previewLayer, at: 0)
session.startRunning()
}
}
}
} catch {
print(error.localizedDescription)
}

Answer 1

There are several issues I find in your code, so the updated version with the comments on it would look like this:
let session = AVCaptureSession()
self.session = session
// `This method is used to start the flow of data from the inputs to the outputs connected to the AVCaptureSession instance that is the receiver.`
//session.startRunning() // Don't startRunning until everything is configured
session.sessionPreset = AVCaptureSessionPresetPhoto
do {
let input = try AVCaptureDeviceInput(device: device)
// session.addInput(input) // This one has to be after you check if you `canAddInput`
if session.canAddInput(input) {
session.addInput(input)
let stillImageOutput = AVCapturePhotoOutput()
self.stillImageOutput = stillImageOutput
let settings = AVCapturePhotoSettings()
// stillImageOutput.capturePhoto(with: settings, delegate: self) // This one might want to be called after you add it as an output to the `session`
if session.canAddOutput(stillImageOutput) {
session.addOutput(stillImageOutput)
if let previewLayer = AVCaptureVideoPreviewLayer(session: session) {
self.previewLayer = previewLayer
previewLayer.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer.connection!.videoOrientation = AVCaptureVideoOrientation.portrait
viewController.centerView.layer.insertSublayer(previewLayer, at: 0)
session.startRunning()
}
stillImageOutput.capturePhoto(with: settings, delegate: self)
}
}
} catch {
print(error.localizedDescription)
}