buildscript { repositories { jcenter() mavenCentral() maven { url 'https://dl.bintray.com/kotlin/kotlin-dev' } } dependencies { classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.11" } } apply plugin: "kotlin" repositories { jcenter() mavenCentral() maven { url 'https://dl.bintray.com/kotlin/kotlin-dev' } } dependencies { compile "org.jetbrains.kotlin:kotlin-stdlib" } compileKotlin { kotlinOptions { freeCompilerArgs = ["-XXLanguage:+SamConversionForKotlinFunctions"] // Free compiler arguments } }