please remove usages of `jcenter()` maven repository from your build scripts and migrate your build to other maven repositories.
// For koin, change the group id from org.koin to io.insert-koin - the latter is published on maven central.
// For chartboost, you can use the following repo:
maven {
url "https://dl.bintray.com/google/mobile-ads-adapters-android/"
}