PDF mPDF extension error

Hi i m using mPDF i just install through this instructions: http://demos.krajee.com/mpdf#installation

in my project and i put this code in main.php :

use kartik\mpdf\Pdf;

‘pdf’ => [

        'class' => Pdf::classname(),


        'format' => Pdf::FORMAT_A4,


        'orientation' => Pdf::ORIENT_PORTRAIT,


        'destination' => Pdf::DEST_BROWSER,


      // refer settings section for all configuration options


    ],

and gives me this error: ( ! ) Fatal error: Class ‘kartik\mpdf\Pdf’ not found in C:\wamp\www\project\app\frontend\config\main.php on line 34

Thanks.

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