Laravel/ Lumen formRequest throwing error on submitting all valid values

I'm using this library for formRequest feature in my Lumen application. I had installed and configured as mentioned in docs but there seems to be somewhere I might be missing or issue in library. Following is my sample code

Validation Class: <?php namespace App\Http\Requests;

use Pearl\RequestValidate\RequestAbstract;
use Illuminate\Validation\Rule;
use Illuminate\Http\Response;

class CommentFormRequest extends RequestAbstract
{

    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {

        return [
            'name' => 'required'    
            'title' => 'required|max:255',
            'body' => 'required',
        ];
    }

    /**
     * Get custom messages for validator errors.
     *
     * @return array
     */
    public function messages()
    {
        return [
            //
        ];
    }
}

Controller:

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests\CommentFormRequest;

class CommentController extends Controller
{

    public function add(CommentFormRequest $request)
    {
        $request->validated();

       return response()->json(['Success']);
    }       

}

When I submit invalid data from postman, valid errors are thrown but when I submit valid data without missing any form field then following error is showing.

(1/1) BadMethodCallException
Method App\Http\Requests\CommentFormRequest::validated does not exist.

Above error totally making me confusion because if validated method is not found then how its throwing error for invalid data? I had tried to debug the issue but as I'm new to Lumen nothing I'm able to figure it out to fix this issue.