I am not getting why it pop up in some device only and what it means. coz i am just a newbie.
What extensions do you have in your app?
I used Google admob extension for ads
Why would you start using ads if you are a newbie?
Newbies can't publish app with ad or what?
I thought app is completed so I wanted to earn from it.. simple
Maybe give some info about the devices that give errors. Android version, which extension you use, etc.
I can not help with ad-related questions since I really don't like ads in apps.
Always post links to used extensions.