Hello everyone, I am trying to use kotlin android extension in Android Studio 2.1.2 and the latest kotlin (1.2-1 ?), but the gradle compiler says that it can't find the reference kotlinx (I've added the line "apply plugin: 'kotlin-android-extensions'" in my app build.gradle, and "import kotlinx.android.synthetic.main.activity_main.*" in the main activity. What did I miss ?