Msg: TypeError: Cannot read property 'initialize' of undefined

[inspire22]

import { Plugins } from "@capacitor/core";
const { AdMob } = Plugins;
import { AdSize, AdPosition } from "capacitor-admob";
export default {
  mounted() {
    console.log("mounted");
    var options = {
      adId: "ca-app-pub-1234/5678",
      adSize: AdSize.BANNER,
      position: AdPosition.BOTTOM_CENTER,
    };
    // ypeError: Cannot read property 'initialize' of undefined

    AdMob.initialize(options);
    console.log("inited", options);

It never reaches "inited", and gives this error in the android studio logcat:
Msg: TypeError: Cannot read property 'initialize' of undefined

Any suggestions please?