Mass Assignment Expection with create and update methods

I have strange issue while using create or update methods on laravel tinker although i added $fillable array

table fields as follows

1. id
2. title
3. body
4. published_at
5. timestamps

model as follows

    <?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Article extends Model
{
    protected $fillable = ['title','body'];
}

command line i typed

$article = App\Article::create(['title' => 'ready']);

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