Shopware 6 Plugin Activation Error: Class "SwagOktaSSO\Controller\AuthController" Not Found

I am creating custom plugin for Shopware 6. Below is zip file structure:

└── SwagOktaSSO/
    ├── src/
    │   ├── Controller/
    │   │   ├── AuthController.php
    │   ├── Resources/
    │   │   ├── config/
    │   │   │   ├── services.xml
    │   ├── SwagOktaSSO.php
    ├── composer.json
    ├── plugin.xml

services.xml has below code:

<service id="SwagOktaSSO\Controller\AuthController"
         class="SwagOktaSSO\Controller\AuthController"
         public="true">
    <argument type="service" id="Shopware\Core\System\SystemConfig\SystemConfigService" />
    <tag name="controller.service_arguments"/>
</service>

composer.json has below code:

{
  "name": "swag/okta-sso",
  "description": "Okta SSO integration for Shopware",
  "version": "1.0.0",
  "type": "shopware-platform-plugin",
  "license": "MIT",
  "authors": [
    {
      "name": "Shopware"
    }
  ],
  "require": {
    "shopware/core": "~6.6.0"
  },
  "autoload": {
    "psr-4": {
      "SwagOktaSSO\\": "src/"
    }
  },
  "extra": {
    "shopware-plugin-class": "SwagOktaSSO\\SwagOktaSSO",
    "label": {
      "de-DE": "SwagOktaSSO",
      "en-GB": "SwagOktaSSO"
    },
    "description": {
      "de-DE": "Beschreibung in der Administration für das Plugin",
      "en-GB": "Description in the Administration for this plugin"
    }
  }
}

AuthController.php:

<?php
namespace SwagOktaSSO\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Auth0\SDK\Auth0;

class AuthController extends AbstractController
{
.....
} 

SwagOktaSSO.php:

<?php declare(strict_types=1);

namespace Swag\OktaSSO;

use Shopware\Core\Framework\Plugin;

class SwagOktaSSO extends Plugin
{
}   

I upload my .zip file from Extension -> My extension -> Upload extension; it successfully uploaded and installed. However, it creates a problem while activating this plugin.

The error is as below:

Internal Server Error

Class "SwagOktaSSO\Controller\AuthController" used for service 
"SwagOktaSSO\Controller\AuthController" cannot be found.

How to solve this issue and activate my custom plugin? I only have a myshop/admin login. No server access. Please guide me through.

Thanks in advance!

The configuration is generally okay.

However, the namespace declared in your main plugin class, SwagOktaSSO.php, does not match the shopware-plugin-class entry in your composer.json file.

namespace Swag\OktaSSO

"shopware-plugin-class": "SwagOktaSSO\\SwagOktaSSO",

It likely fails to properly load the rest of the plugin's resources, which is strange, It's unusual for a plugin to be installed with such a mismatch.