在null上调用成员函数define（） - Laravel [关闭]

I'm getting error: Call to a member function define() on null

Here is my code:

$factory->define(App\User::class, function (Faker $faker) {
    static $password;

    return [
        'name' => $faker->name,
        'email' => $faker->unique()->safeEmail,
        'password' => $password ?: $password = bcrypt('secret'),
        'remember_token' => str_random(10),
    ];
});

Got the answer i just needed to include the html form aliases and packages..