only preloadRewardedVideoAd working but other don't working

[yudinmaxim]

I am using nativescript-vue last versions (ns: 6.8.0, ns-vue: 2.6.4)
I will try used nativescript-admob for showing: "showInterstitial" and "showRewardedVideoAd"
But in my program working correctly only "preloadRewardedVideoAd", other "preloaders" get an error message like "error - 0".

For preloading I am using that code:
try {
await admob.preloadInterstitial({
testing: true,
iosInterstitialId: this.settings.admob.onlyShow.ios, // add your own
androidInterstitialId: this.settings.admob.onlyShow.android, // add your own
// Android automatically adds the connected device as test device with testing:true, iOS does not
//iosTestDeviceIds: ["ce97330130c9047ce0d4430d37d713b2"],
keywords: ["keyword1", "keyword2"], // add keywords for ad targeting
onAdClosed: function() {
console.log("interstitial closed");
},
});
console.log("Interstitial preloaded");

    return true;
  } catch (error) {
    console.log("preloadInterstitial ERROR: " + error);
  }