java.lang.NoClassDefFoundError

[Uriel]

Thanks a lot for your very quick reply
Yes I followed the steps described here:

[OUTDATED][Free] Admob Extension - Add different types of AdMob ads in your application

[image] Admob Extension These extensions will help you to integrate AdMob ads and ads from partner networks as mediation in your app-inventor application. Get Started : You should first integrate the necessary libraries required to display ads in your application. I've added all the SDK libraries required in this AdmobSdks Extension and ExtraSdks Extension. So, to integrate any of the ad-type even mediation, you should first download these extensions, add these two extensions to your appli…