this error message means that your custom view is ...

# anko

[nevinchen]

this error message means that your custom view is not defined in Anko DSL. You may need to do something like this[https://github.com/JetBrains/anko#is-it-extensible]

public inline fun ViewManager.mapView() = mapView {}
public inline fun ViewManager.mapView(init: MapView.() -> Unit): MapView {
    return ankoView({ MapView(it) }, init)
}