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when you update lets encrypt, new /home/admin/conf/web/xxx.xx.apache2.ssl.conf /home/admin/conf/web/xxx.xx.nginx.ssl.conf is generated and compare with the old file to see if have modified any changes, example: root or DocumentRoot

Looks like you haven't installed magento side extension (OpenLabs). See http://odoo-magento-connector.com/guides/installation_guide.html#installation