Can't run my game on Android 4.4.2

Hi.
Previously I have been able to run my game on android 4.4.2, but recently it stopped working. It just crashes when you try to start the game. Here is the crash reports:

I have only tested my game on android 5.x.x where it still runs perfectly. Is this a common bug or something specific to my project?

I recently added google play services(leaderboards and achievements) and admob to the game. Could that cause this?

Thanks. Any help is apriciated.

This was an error I got because I was using the wrong api-level.

I’m using 4.20, and I can’t build for 4.4.2 too, I have API 19 installed but I get an error message telling me:Requires at least SDK API level 23, currently set to ‘android-19’
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): ERROR: Can’t make an APK without SDK API ‘android-23’ minimum installed

1.goto you “NVPACK\android-sdk-windows\tools”
2.open android.bat
3.after that navida package downloader appears then download API 28(now it is minimum requirement to package your project for android).