Undefined name 'currentUser'

Try correcting the name to one that is defined, or defining the name. am trying to create profile page that the auth user will see or appear to the user

//import 'package:flutter/material.dart';
//import 'package:yumor/models/user_model.dart';
//import 'package:yumor/pages/Home_page.dart';
//import 'package:yumor/pages/profile.dart';
//import 'package:yumor/pages/search.dart';
//import 'package:yumor/pages/upload.dart';

//class BottomBar extends StatefulWidget {
  //const BottomBar({Key? key}) : super(key: key);

  //@override
  //State<BottomBar> createState() => _BottomBarState();
//}

//class _BottomBarState extends State<BottomBar> {
  List pages = [
    home_page(),
    search(),
    upload(),
    profile(userProfile:currentUser?.uid),
  ];
//  this current index means that this index depends on which one you click form 0 to 4
 
~~~!