React native expo there is no singleton instance error

Hello
I am developing an application with React Native Expo, but I am getting the error below. My configurations are complete, I was able to pull the products before and made the purchase.

 LOG  Error fetching products:  [Error: There is no singleton instance. Make sure you configure Purchases before trying to get the default instance. More info here: https://errors.rev.cat/configuring-sdk]

React.useEffect(() => {

        Purchases.isConfigured().then((configured) => {

            if (!configured) {
                const resp = Purchases.configure({ apiKey: Platform.OS == "android" ? "goo******" : "ap/***********n" });
                console.log("resp",resp) //undefined 
            } else {
                fetchProducts()
            }
        })

    }, []);

    const fetchProducts = async () => {
        try {
            const offerings = await Purchases.getOfferings();

            const availableProducts = offerings.current?.availablePackages;
            setProducts(availableProducts || []);
        } catch (error) {
            console.log("Error fetching products: ", error);
        }
    };