In BookLibarry ordasoft.com/book-library-joomla-ebook-extension
appear error after upgrade site to joomla 3.8
Before any update, please check update on test site.
Before do update on production site, please check: Do you have full site backup(files and database)
For fix error - you need in file:
require_once ($mosConfig_absolute_path . "/libraries/joomla/factory.php");
Please backup this file first