[2016-09-01 19:14:49] production.ERROR: exception 'October\Rain\Exception\SystemException' with message 'Unable to find configuration file /var/www/clients/.../web/plugins/plugins/laminsanneh/fantasticfaq/models/faqgroup/columns.yaml defined for Backend\Behaviors\ListController.' in /var/www/clients/.../web/modules/system/traits/ConfigMaker.php:63

Note the plugins/plugins in the path, it is doubled up

Ah I found the reason. I forgot to delete the "plugin" from the pull request: https://github.com/LaminSanneh/Octobercms-Fantastic-Faq-Plugin/pull/7/files