Android Studio – Android template error Transformation.map

I’ve tryied to use a template (tabbed view activity) in a new project (java).. but it won’t run (no code modifications). Version 2.1.2 on Win 11
error given:

C:ProgettiAndroidTestappsrcmainjavaitgattonerophtestuimainPageViewModel.java:12: error: method map in class Transformations cannot be applied to given types;
private LiveData mText = Transformations.map(mIndex, new Function<Integer, String>() {
^
required: LiveData,Function1<X,Y>
found: MutableLiveData,<anonymous Function<Integer,String>>
reason: cannot infer type-variable(s) X,Y
(argument mismatch; <anonymous Function<Integer,String>> cannot be converted to Function1<X,Y>)
where X,Y are type-variables:
X extends Object declared in method <X,Y>map(LiveData,Function1<X,Y>)
Y extends Object declared in method <X,Y>map(LiveData,Function1<X,Y>)

class

public class PageViewModel extends ViewModel {

    private MutableLiveData<Integer> mIndex = new MutableLiveData<>();
    private LiveData<String> mText = Transformations.map(mIndex, new Function<Integer, String>() {
        @Override
        public String apply(Integer input) {
            return "Hello world from section: " + input;
        }
    });

    public void setIndex(int index) {
        mIndex.setValue(index);
    }

    public LiveData<String> getText() {
        return mText;
    }
}

why? I’ve no idea why this template seems to be broken.