Can't build my android project

@Renoki, What a coincident, I am one of the developer of the asset. You can wait till someone wake up and answer instead of ranting us at 3AM.

As the problem it have been answer here:

https://answers.unity.com/questions/1433516/gradle-build-error-1.html

From @CyanDeveloper:

That's because you have probably import UnityADS from Asset store and also checked the "Enable built-in Ads extension" in the "Services" -> "Unity ADS" -> "Advanced" Unchecking that option tell unity to use the package downloaded from asset store