error [ReflectionException] Class DatabaseSeeder does not exist

al ejecutar cesar@sisweb:/var/www/html/contact_manager$ php artisan db:seed 

marca

Just wondering before "[ReflectionException] Class DatabaseSeeder does not exist" it was [ReflectionException] Class database\seeds\userTableSeeder does not exist

after trying all suggested putting namespace in it showed in the links and several call of commands "composer dump-autoload" and "php artisan clear-compiled" it suddenly become the Class DatabaseSeeder.

use Illuminate\Database\Seeder;

class DatabaseSeeder extends Seeder

{

    /**

     * Run the database seeds.

     *

     * @return void

     */

    public function run()

    {

        // $this->call(UsersTableSeeder::class);

    //Eloquent::unguard();

        $this->call(GroupTableSeeder::class);

        $this->call(ContactTableSeeder::class);

    }

}

<?php

use Illuminate\Database\Seeder;

class GroupTableSeeder extends Seeder

{

    /**

     * Run the database seeds.

     *

     * @return void

     */

    public function run()

    {

        //

        DB::statement('SET FOREIGN_KEY_CHECKS=0');

        DB::table('groups')->truncate();

        $groups = [

        ['id' => 1, 'name' => 'Family', 'created_at' => new DateTime, 'updated_at' => new DateTime],

        ['id' => 2, 'name' => 'Friends', 'created_at' => new DateTime, 'updated_at' => new DateTime],

        ['id' => 3, 'name' => 'Clients', 'created_at' => new DateTime, 'updated_at' => new DateTime],

        ];

        DB::table('groups')->insert($groups);

    }

}

<?php

use Illuminate\Database\Seeder;

use Faker\Factory as Faker;

class ContactTableSeeder extends Seeder

{

    /**

     * Run the database seeds.

     *

     * @return void

     */

    public function run()

    {

        //

        DB::table('contacts')->truncate();

        $faker = Faker::create();

        $contacts = [];

        foreach (range(1,20) as $index) {

        $contacts[]= [

        'name' => $faker->name,

        'email' => $faker->email,

        'phone' => $faker->phoneNumber,

        'address' => "{$faker->streetName} {$faker->postcode} {$faker->city}",

        'company' => $faker->company,

        'created_at' => new DateTime,

        'updated_at' => new DateTime,

        ];

        }

     

        DB::table('contacts')->insert($contacts);

    }

}