Android could not get unknown property for applicationVariants

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could not get unknown property for 'applicationVariants' for BuildType xxxx

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buildTypes {
    release {
        applicationVariants.all { variant ->
            appendVersionName(variant, defaultConfig)
        }
    }
}

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buildTypes {
    release {
       libraryVariants.all { variant ->
            appendVersionName(variant, defaultConfig)
        }
    }
}