SVGkit doesn't work - ios

Question

I have used SVGkit and my code have a error.
When I exec the app, the images load but the xCode shows the error and it close my app.
When I exec the app, the images load but the xCode shows the error and it close my app.
When I exec the app, the images load but the xCode shows the error and it close my app.
tableview function
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as? TableViewCell
// else {
// return UITableViewCell()
// }
//print("cantidad: \(self.banderas.count)")
DispatchQueue.global().async {
if !self.banderas.isEmpty {
if !indexPath.isEmpty{
//print(self.banderas[indexPath.row].bandera)
if self.banderas[indexPath.row].bandera != ""{
let url = URL(string: ("\(self.banderas[indexPath.row].bandera)"))
if url != nil {
let data = try? Data(contentsOf: url!)
DispatchQueue.main.async {
guard let anSVGImage: SVGKImage = SVGKImage(data: data!) else {
return
}
cell?.labelNombre.text = "\(self.banderas[indexPath.row].nombre)"
cell?.labelIdioma.text = "\(self.banderas[indexPath.row].idioma)"
cell?.labelMoneda.text = "\(self.banderas[indexPath.row].moneda)"
cell?.imageCell.image = anSVGImage.uiImage
}
}
}
}
}
}
return cell!
}
CARGAR FUNCTION.
func cargar(){
let url = "https://restcountries.eu/rest/v2/all"
Alamofire.request(url).responseJSON { (response) in
//let result = response.data
if let value = response.result.value {
let json = JSON(value)
self.totalCountries = json.count
var contador = 0
let jsonArray = json.arrayValue
for arr in jsonArray{
let nombre = arr["name"].stringValue
let banderaUrl = arr["flag"].stringValue
var moneda = ""
var idioma = ""
contador = 0
for item in arr["currencies"].arrayValue {
if contador == 0{
moneda = item["code"].stringValue
}
contador += 1
}
contador = 0
for item in arr["languages"].arrayValue {
if contador == 0{
idioma = item["nativeName"].stringValue
}
contador += 1
}
let banderaIndividual = Banderas(nombre: nombre, idioma: idioma, moneda: moneda, bandera: banderaUrl)
self.banderas.append(banderaIndividual)
}
}
self.banderasBuscar = self.banderas
self.tabla.reloadData()
}
// print(self.countriesLista.first?.bandera)
}
This is my code, the error is:
NSAssert( linkedElement != nil, #"Found an SVG <use> tag that points to a non-existent element. Missing element: id = %#", linkHref );
I don't know what happen, please help.