Check it out , if you have build.gradle.kts,

allprojects {
    repositories {
        google()
        mavenCentral()
    }

    subprojects {
        afterEvaluate {
            if (plugins.hasPlugin("com.android.library")) {
                extensions.configure<com.android.build.gradle.LibraryExtension>("android") {
                    if (namespace == null) {
                        namespace = group.toString()
                    }
                }
            }
        }
    }
}