Symfony2 + psliwa PHPPdf

I have installed pdliwa PHPPdf in my Symfony2, I was testing the examples in the route \vendor\psliwa\php-pdf\examples and all worked fine except one.

The one that isnt working is barcode.xml. When I try to test it this error msg appear:

FatalErrorException: Error: Class 'Zend\Barcode\Object\Code128' not found in 
C:\xampp\htdocs\Symfony\vendor\psliwa\php-pdf\lib\PHPPdf\Core\Node\Barcode.php line 175

I have zendframework in my vendor folder.

Anyone knows whats the problem?

You have to update your composer.json file, adding zend-barcode and zend-validator (which is required by zend-barcode). Then it works.