php - How to get rig of the error Fuction () does not exist in laravel 8x?

one text

Route::namespace('Auth')->group(function () {
  Route::get('/login','LoginController@show_login_form')->name('login');
  Route::post('/login','LoginController@process_login')->name('login');
  Route::get('/register','LoginController@show_signup_form')->name('register');
  Route::post('/register','LoginController@process_signup');
  Route::post('/logout','LoginController@logout')->name('logout');
});

This is my route in laravel 8x, but it tells me that Fuction () does not exist. What can i do?