There are no commands defined in the "customplugin" namespace

I am trying to create custom command for vendor package for Mautic. I am getting this error "There are no commands defined in the "customplugin" namespace. Following as per Symfony documentation for creating custom command. https://symfony.com/doc/4.4/console.html any help here ?

PHP: 7.4 Mautic version : 4.0.0 Composer.json :

"require-dev": {
    "symfony/web-profiler-bundle": "~4.4.0",
    "symfony/var-dumper": "~4.4.0",
    "symfony/browser-kit": "~4.4.0",
    "symfony/dom-crawler": "~4.4.0",
    "mautic/transifex": "^4.0",
    "http-interop/http-factory-guzzle": "^1.0",
    "webfactory/exceptions-bundle": "~4.3",
    "friendsofphp/php-cs-fixer": "~2.16.1",
    "liip/test-fixtures-bundle": "^1.6",
    "phpstan/phpstan": "0.12.25",
    "rector/rector-prefixed": "^0.6.13",
    "symfony/phpunit-bridge": "~5.1.0",
    "phpunit/phpunit": "^9.5",
    "liip/functional-test-bundle": "^4.2",
    "php-http/mock-client": "^1.4", 
  } 

Command/PluginCommand.php

<?php

// src/Command/PluginCommand.php
namespace Aviboy2006\MauticPluginCreator\Command;


use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class PluginCommand extends Command
{
    
 
    // the name of the command (the part after "bin/console")
    protected static $defaultName = 'customplugin:create';

    protected function configure(): void
    {
        // ...
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        // ... put here the code to create the user

        // this method must return an integer number with the "exit status code"
        // of the command.

        // return this if there was no problem running the command
        return 0;

        // or return this if some error happened during the execution
        // return 1;
    }
}

Tried clearing cache but nothing is working.

source https://stackoverflow.com/questions/67926757/there-are-no-commands-defined-in-the-customplugin-namespace