Why does an error appear when accessing this controller?

This is how I accessed ithttp://localhost/a/shop/index.php/admin/goods/manager/login
This controller path is like this

The code inside

is:

<code><?php
 
namespace Admin\Controller;
use Think\Controller;
 class ManagerController extends Controller
 {
     function login()
     {
         echo "aaa";;
     }
 }

?></code>

The error message is like this

Reply content:

This is how I accessed ithttp://localhost/a/shop/index.php/admin/goods/manager/login
This controller path is like this

The code inside

is:

<code><?php
 
namespace Admin\Controller;
use Think\Controller;
 class ManagerController extends Controller
 {
     function login()
     {
         echo "aaa";;
     }
 }

?></code>

The error message is like this

http://localhost/a/shop/index.php/Admin/Manager/login