Enabled experimental flag to use layout-containers

app/build.gradle

@@ -2,6 +2,10 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
+androidExtensions {
+    experimental = true
+}
+
 android {
     compileSdkVersion 27
     buildToolsVersion '27.0.3'