Posted on: May 22, 2018, 05:24:27 AM
The template doesn't effect the backend of the website or access to the administrator portal. It sounds like something is wrong with your Joomla installation. I would suggest contacting your host to have them do a restore of your files and database back to a working date, most hosts hold several weeks worth of backups. If that doesn't work you'll need post on joomla.org's forum boards as this pertains to their CMS.