React-native-iap: Am getting error : The sku was not found. Please fetch products first by calling getItems

3.0.0 of react-native-iap

0.57.8 of react-native

Platforms you faced the error (IOS or Android or both?)

Expected behavior

After successful subscribe get the receipt

Actual behavior

Subscription getting error
"The sku was not found. Please fetch products first by calling getItems"

Tested environment (Real Device)

Steps to reproduce the behavior

const itemSkus = Platform.select({
ios: [
''
],
android: [
'sub_1'
]
});

Step 1:
async componentDidMount() {
const msg = await RNIap.initConnection();
const items = await RNIap.getProducts(itemSkus);
RNIap.getProducts(items).then((products) => {
}).catch((error) => {
console.log("inApp getProducts error ",error.message);
})
}

Step 2: Call subscribe
_subscribe(){

  RNIap.buySubscription('sub_1').then(purchase => {
    console.log("inApp Subscription transactionReceipt ",purchase.transactionReceipt);
   }).catch((error) => {
    console.log("inApp Subscription error",error.message);
   })
}

it throws error "The sku was not found. Please fetch products first by calling getItems"