Getting error command does not exist in task scheduling Laravel

I am following this tutorial: https://www.sitepoint.com/managing-cronjobs-with-laravel/

but when I type in command line php artisan make:list or php artisan abcd i get an error message

  [ReflectionException]
  Class App\Console\App\Console\Command\Test123 does not exist

How to fix above issue? What am I doing wrong?

Test123.php

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Carbon\Carbon;

use Response;
use Config;
use DB;
use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Client;

class Test123 extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'abcd';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'some description';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
           $parameters = [
        'attribute1' => 'val1',
        'attribute2' => 'val2',
        '_token' => Config::get('app.secret')
        ];
        $formattedParameters = http_build_query($parameters);
        $statusCode = 200;
        $url = "url?{$formattedParameters}"; 

        $client = new Client();
        $res = $client->get($url);

        $jsonArray = json_decode($res->getBody(),true);
        $field1= $jsonArray['field1'];

        DB::table('table_name')->insert(
    ['field1' => $field1]
);
    }
}

Kernel.php

<?php

namespace App\Console;

use Illuminate\Console\Scheduling\Schedule;
use Illuminate\Foundation\Console\Kernel as ConsoleKernel;
use Carbon\Carbon;

use Response;
use Config;
use DB;
use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Client;


class Kernel extends ConsoleKernel
{
    /**
     * The Artisan commands provided by your application.
     *
     * @var array
     */
    protected $commands = [
    App\Console\Command\Test123::class,
    ];

    /**
     * Define the application's command schedule.
     *
     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
     * @return void
     */
    protected function schedule(Schedule $schedule)
    {

        $schedule->command('abcd')->everyMinute();



    }

    /**
     * Register the Closure based commands for the application.
     *
     * @return void
     */
    protected function commands()
    {
        require base_path('routes/console.php');
    }
}

via Murlidhar Fichadia