This bundle requires PuMuKIT version 3 or higher. To import data on lower versions use PumukitExampleDataBundle
composer require teltek/pumukit-import-data-bundle
if not, add this to config/bundles.php
Pumukit\ImportDataBundle\PumukitImportDataBundle::class => ['all' => true]
Then execute the following commands
php bin/console cache:clear
php bin/console cache:clear --env=prod
php bin/console assets:install