English: Your installation of WooCommerce is incomplete. If you installed WooCommerce from GitHub, please refer to this document to set up your development environment: https://github.com/woocommerce/woocommerce/wiki/How-to-set-up-WooCommerce-development-environment
Dutch: Je installatie van WooCommerce is niet voltooid. Als je WooCommerce via GitHub hebt geïnstalleerd, bekijk dan dit document om je ontwikkelingsomgeving te configureren: https://github.com/woocommerce/woocommerce/wiki/How-to-set-up-WooCommerce-development-environment