Download bigfoot / core-bundle / assets.yml - Solve class 'assets' not found

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assetic:
    assets:
        admin_js:
            inputs:
                - 'bundles/bigfootcore/js/nestable.js'
                - 'bundles/bigfootcore/js/bootstrap-modalmanager.js'
                - 'bundles/bigfootcore/js/bootstrap-modal.js'
                - 'bundles/bigfootcore/js/modal.js'
                - 'bundles/bigfootcore/js/jquery.form.js'
                - 'bundles/fosjsrouting/js/router.js'
        admin_css:
            inputs:
                - 'bundles/bigfootcore/css/bootstrap-modal-bs3patch.css'
                - 'bundles/bigfootcore/css/bootstrap-modal.css'
        admin_twig_js:
            inputs:
                - '@BigfootCoreBundle/Resources/views/translation/locale_tabs.html.twig'