今天用tinker生成测试出错

写详细点，等大神回答，为什么会出错

我是用migrate生成的数据表

public function up()
    {
        Schema::create('notice', function (Blueprint $table) {
            $table->increments('id');
            $table->string('title');
            $table->text('content');
            $table->integer('user_id')->default('0');
            $table->timestamps();
        });
    }

然后我的model是

php artisan make:model Models/Notice

Models/Notice.php 模型里只写了

protected $table = 'notice';
protected $fillable = ['title','content'];

ModelFactory.php 是这样的

$factory->define(App\Models\Notice::class, function (Faker\Generator $faker) {
    return [
        'title' => $faker->sentences,
        'content' => $faker->paragraph,
    ];
});