TableView does not populate JSON array in Swift 3 - arrays

Question

I've read a lot of related questions here, but am still struggling with populating my tableview. I get the result from the print(firstname) and print(lastname) in the console. But nothing appears in the tableview.
The Table view has a Prototype cell with identifier BasicCell.
Any idea why the table is not populating?
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var listTableView: UITableView!
let URL_GET_PERSONAGE = "http://somesite.net/somescript.php"
var firstnames: [String] = []
var lastnames: [String] = []
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: URL_GET_PERSONAGE)
do{
let allContactsData = try Data(contentsOf: url!)
let allContacts = try JSONSerialization.jsonObject(with: allContactsData, options: JSONSerialization.ReadingOptions.allowFragments) as! [String : AnyObject]
if let arrJSON = allContacts["teams"] as? NSArray{
for index in 0..<arrJSON.count{
let aObject = arrJSON[index] as? [String : AnyObject]
firstnames.append(aObject?["fname"] as! String)
lastnames.append(aObject?["lname"] as! String)
}
print(firstnames)
print(lastnames)
listTableView.reloadData()
}
}
catch {
}
}
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
return self.firstnames.count;
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let cell: UITableViewCell! = self.listTableView.dequeueReusableCell(withIdentifier: "BasicCell", for: indexPath as IndexPath) as UITableViewCell!
cell.textLabel?.text = self.firstnames[indexPath.row]
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}