Error when I compile release Android Studio with unity ads, chartboost

Error when I compile release Android Studio with unity ads, chartboost
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Error when I compile release Android Studio with unity ads, chartboost.
Errors: Bai1:transformclassesandresourceswithproguardforrelease
14%20AM

Please, Help Me.

When I complie release Android Studio with Admob. It’s ok.
Who help me?

Doesn’t proguard only apply to release builds?

I have found one way, It is not to use Proguard in release