A modern programming language that makes developers happier.

kotlinlang

```ext.kotlin_version = '1.1.3-2'
classpath 'com.android.tools.build:gradle:2.3.3'

and

kapt "com.android.databinding:compiler:2.3.0"
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"```

Which version of Android Studio are you using? Are you using Android Studio 2.3.+ stable or are using one of the canary / beta 3.0 versions? 3.0 has Kotlin already built in.Did you have the android kotlin  plugin?

There also should be `classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"` in buildscript dependencies