RecycleListView无法强转?

 Caused by: java.lang.ClassCastException: androidx.appcompat.app.AlertController$RecycleListView cannot be cast to androidx.recyclerview.widget.RecyclerView

    at com.example.myapplication.MainActivity.onCreate(MainActivity.java:32)

mlist =(RecyclerView)this.findViewById(R.id.recycle_view);
private RecyclerView mlist;