Fix bug in my Android App and updated ads platform.

Hi,

I require someone to fix my android app, which has significantly lost revenue in the past week. This is due to limited ad impressions, which has caused users emailing me, telling me that the app ads aren't loading. To my concern, I installed my app on my samsung phone, but it cannot load up for some reason, resulting in a crash.

I would like to find out why this, I need someone to fix this and possibly integrate a new ads platform to fix the impressions.