Delete the line
/home/barbar84/www/wp-conte.../plugins/updraftp.../includes/Dropbox2/OAuth/Storage
File: Encrypter.php

Dòng [16/116]:
We could deliberately re-encrypt all loaded information with phpseclib native, but there seems little need for that yet. There can only be a problem if mcrypt is disabled - which pre-July-2015 meant that Dropbox wouldn't work at all. Now, it will force a re-authorisation.
Fix

Ấn tiếp tục để Delete và ở lại trang, ấn Delete để Delete và quay về List dòng
Function