After checking by my host, he is currently viewing the following error:
Fatal error: bx_import fatal error: class (BxTemplEditorQuill) wasn't found in /home/cp1663392p24/public_html/Community-Libertine.fr/inc/utils.inc.php on line 778
If you have any third party plug-ins one of them could have been the cause. I had to disable one after doing a fresh install of UNA and installing said plug-in.