ReflectionException: Class doesn’t exist in ReflectionMethod when creating web page in module [closed]

Im attempting to create a primary web page via a module like right here

I’ve created a landing_page.data.yml

title: Touchdown Web page kind: module description: 'Touchdown Web page' core_version_requirement: ^8.7.7 || ^9 

In Drupal Developer similar folder landing_page.routing.yml

landing_page.touchdown:   path: '/landing_page'   defaults:     _controller: 'Drupallanding_pageControllerlandingpageController::placeholder'     _title: 'A touchdown web page'   necessities:     _permission: 'entry content material' 

Then at src/Controller/landingpage.php

<?php  namespace Drupallanding_pageController;  use DrupalCoreControllerControllerBase;      class landingpage extends ControllerBase {    public operate placeholder() {     return [       '#markup' => 'placeholder landing page',     ];   }  } 

It really works on my localhost however after I add to my server I get

ReflectionException: Class Drupallanding_pageControllerlandingpageController doesn't exist in ReflectionMethod->__construct() (line 128 of Drupal/Core/Entity/EntityResolverManager.php). 

Ive checked all over the place right here, right here, plus extra. Have tried re-writing for final 2 hours however nonetheless get similar error. Works on localhost, provides error on server. Thanks

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ReflectionException: Class doesn’t exist in ReflectionMethod when creating web page in module [closed]

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