NetworkError (DOM Exception 19): A network error occurred

Does anyone have ANY idea why this code (which runs fine on an iOS 9 device, an iOS 10.3.3 device and an iOS 11 device) on an iOS 10.3.2 device fails with the error shown below?:

let alert = this.alertCtrl.create({
          title: "hello",
          subTitle: "please display",
          buttons: ['OK']

console.log("Here we go....");

.then(() => {
            console.log("displayed ok");
.catch((error) => {
            console.log("error:", error);



Here we go.....
error: NetworkError (DOM Exception 19): A network error occurred.

Does anyone know if 10.3.2 is a version of iOS that has known issues with Ionic/Cordova? Could it be the actual device itself that causes this - it seems a bit odd?

I ha ve the same problem