Error in using PHP fakers

Question

I am trying to seed data as provided in this link https://github.com/fzaninotto/Faker. The tables are filled but but I got this error:

    $ php artisan db:seed
    Seeding: gamesSeeder

  Method Illuminate\Database\Query\Builder::issues does not exist.

I am running Lumen (5.6.3) (Laravel Components 5.6.*).

<?php


$factory->define(App\teams::class, function (Faker\Generator $faker) {
    return [
        'name' => $faker-> word,
    ];
});

$factory->define(App\games::class, function (Faker\Generator $faker) {
    return [
        'Team 1' => $faker-> word,
        'Team 2' => $faker-> word,
        'Score 1' => $faker->numberBetween($min = 0, $max = 10),
        'Score 2' => $faker->numberBetween($min = 0, $max = 10),
        'Game Date' => $faker->date($format = 'Y-m-d', $max = 'now'),
        'Viewers' => $faker-> numberBetween($min = 0, $max = 100000),
    ];
});

Here are my seeders files. teamsSeeder:

<?php

use Illuminate\Database\Seeder;

class gamesSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {

        factory(App\games::class, 30)->create()->each(function($u) {
            $u->issues()->save(factory(App\games::class)->make());
          });
    }
}

and here is gamesSeeder

<?php

use Illuminate\Database\Seeder;
use Illuminate\Database\Eloquent\Model;
use App\teams;

class teamsSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        factory(App\teams::class, 5)->create()->each(function($u) {
            $u->issues()->save(factory(App\teams::class)->make());
          });
    }
}