Class 'PHPJasper\PHPJasper' not found?

I have an app with laravel version 5.4.9 an php 7.0.2

I need to install PHP Jasper, from this url: http://ift.tt/2qzrsJU

I use: composer require geekcom/phpjasper ~1.16.

And then: composer install

It has installed correctly, but when I try to use it:

use PHPJasper\PHPJasper;

It throws me the following error:

FatalThrowableError in MyController.php line 714:
Class 'PHPJasper\PHPJasper' not found

via Chebli Mohamed