Ошибка с recyclerView: setAdapter in RecyclerView cannot be applied to

Есть код

private void initRecyclerView() {
    recyclerView = findViewById(R.id.recycler_view);
    qrAdapter = new QRAdapter(this);
    recyclerView.setAdapter(qrAdapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(
            getApplicationContext(), 
            LinearLayoutManager.HORIZONTAL, 
            false
    ));
}

При наведении на recyclerView.setAdapter(qrAdapter); высвечивается :

setAdapter(androidx.recyclerview.widget.RecyclerView.Adapter)in RecyclerView cannot be applied to (com.example.ayapplication.QR.QRAdapter)