Laravel 5.2 MassAssignmentException in Model.php line 452

I am trying to add "add comment" section in my Blog project, and now am getting error:

MassAssignmentException in Model.php line 452:
body

Here is my CommentsController:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Post;
use App\Comment;
use App\Http\Requests;

class CommentsController extends Controller
{


    public function store(Post $post)
{

    Comment::create([
        'body' => request('body'),
        'post_id' => $post->id
    ]);

    return back();
}
}

I tried to add Protected $fillable for the body field, but still have the same problem.

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