I am getting 'Error The data couldn't be read because it isn't in the correct format' when I try to log in with the simulator

I am using a MongoDB server on Heroku running Parse.The error comes when I push the Sign Up button to send the form to my server. I believe it has something to do with the connection to the server and not the json format as the error suggests.
Code Block
func login() {
// remember user's login
let username : String? = UserDefaults.standard.string(forKey: "username")
// if loged in
if username != nil {
var window: UIWindow?
let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let myTabBar = storyboard.instantiateViewController(withIdentifier: "tabBar") as! UITabBarController
window?.rootViewController = myTabBar
}
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
var window: UIWindow?
// accessing heroku app vi id & keys
Parse.enableLocalDatastore()
// Initialize Parse.
Parse.setApplicationId("example", clientKey: "exmaple")
// [Optional] Track statistics around application opens.
PFAnalytics.trackAppOpened(launchOptions: launchOptions)
// call login function
login()
// color of window
window?.backgroundColor = .white
return true

Which line of code gives you the error? I'm pretty sure that this error is likely because of json parsing failure
I am getting 'Error The data couldn't be read because it isn't in the correct format' when I try to log in with the simulator
 
 
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