Non-fatal Exception: java.lang.Exception

[sharp wing]

private void Awake()
{
DontDestroyOnLoad(this);
if (!BillingServices.IsAvailable()) return;
BillingServices.InitializeStore();

}
private void OnEnable()
{
// register for events
if (!BillingServices.IsAvailable()) return;
BillingServices.OnInitializeStoreComplete += OnInitializeStoreComplete;
BillingServices.OnTransactionStateChange += OnTransactionStateChange;
BillingServices.OnRestorePurchasesComplete += OnRestorePurchasesComplete;

  InAppButton.onClick.AddListener(BuyAdsFree);

}

private void OnDisable()
{
if (!BillingServices.IsAvailable()) return;
// unregister from events
BillingServices.OnInitializeStoreComplete -= OnInitializeStoreComplete;
BillingServices.OnTransactionStateChange -= OnTransactionStateChange;
BillingServices.OnRestorePurchasesComplete -= OnRestorePurchasesComplete;
InAppButton.onClick.RemoveAllListeners();
}
I use tutorials code

[sharp wing]

i error get his point InAppButton.transform.GetChild(0).GetComponent<TextMeshProUGUI>().text = BillingServices.Products[0].Price.ToString(); product is null