Error when compiling [DiffUtil]

[BriFuture]

Hi, did you forget to delcare swipeRefreshLayout:

Here is the build output:
kotlin-android-examples\DiffUtil\app\src\main\java\com\developers\diffutil\MainActivity.kt: (32, 28): Unresolved reference: setOnRefreshListene

[BriFuture]

Maybe Line 36 should be added for build.gradle(Module:app), and now it's OK to compile.