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


[color="#006400"]/* moved to Extensions */[/color]

[color="#006400"]I deleted your other topic you accidentally created :)[/color]