“Extension with name ‘android’ does not exist” error when adding Kotlin to Android project

Android Studio modifies your build.gradle adding apply plugin: 'kotlin-android' above apply plugin: 'com.android.application'. Just move the Kotlin line below the Android one and Gradle will run smoothly. It should look like this example:

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

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