QR Code Generator

Recently I just need to use yiiframework.com/extension/qr-code-generator
It seems to be extremely easy to use - as stay in its Readme file in my view
code I just need to add this line of codes

<?php $this->widget('application.extensions.qrcode.QRCodeGenerator',array(
    'data' => 'have a nice day',
    'subfolderVar' => true,
    'matrixPointSize' => 5,
)) ?>

And so I did. Just after done my view gives just:

Error 500
does not exists.

I know it is a kind of "server" error... I'm using xampp on Windows...
anyhow only this lines of code did it No idea why

Can anyone help me to handle this case