After updating Google Ads SDK to 19.0.0 gives a deprecated warning message for addTestDevice(), while I searched this link for resolving the issue but not succeed. how can I resolve it?

Here my code

mAdView.loadAd(new RequestConfiguration.Builder        .setTestDeviceIds(AdRequest.DEVICE_ID_EMULATOR) // show error        .setTestDeviceIds(DEV_ID) // show error        .build()); 

and developer site suggestion

Deprecated AdRequest.Builder.addTestDevice(). Use RequestConfiguration.Builder.setTestDeviceIds() instead.

I'm using google AdWords for my android application promotion from last 2 years. From the last 4-5 days, my google AdWords campaign runs fast and spending much higher money then it use to be. And that conversion ration is not showing in google console and now even on my Admob. Like Google Adwords showing 9000 install and console says 3400 install from that same day. And no effect on AdMob also.

What happens to Google AdWords? Is any other facing this issue? What wrong I'm doing?

Terminating app due to uncaught exception 'GADInvalidInitializationException', reason: 'The Google Mobile Ads SDK was initialized without an application ID. Google AdMob publishers, follow instructions here: https://googlemobileadssdk.page.link/admob-ios-update-plist to set GADApplicationIdentifier with a valid App ID. Google Ad Manager publishers, follow instructions here: https://googlemobileadssdk.page.link/ad-manager-ios-update-plist