The problem is then show ads.
Huh... what are you doing here?
You cannot use Applovin blocks without initialize Applovin first, this is why it crash.
But if you use Applovin with Heyzap, use the Heyzap "load/show interstitial/video" blocks and not the Applovin blocks.
Then you don't have to initialize Applovin if you use only Heyzap..
In your Heyzap Dashboard enable Applovin under Mediation settings.