"projections are not allowed for immediate arguments of a supertype" Kotlin Android Studio

I am getting this error when I converted Java to Kotlin:

Java

public class HeaderTab extends ExpandableGroup {
    private String header;

    public HeaderTab(String title, List items) {
        super(title, items);
    }
}

Kotlin

class HeaderTab(title: String, items: List<*>) : ExpandableGroup<*>(title, items) {
    private val header: String? = null
}

Android Studio says this:

projections are not allowed for immediate arguments of a supertype

What do I need to modify here?