PHP problem in class_bootstrap.php

[Dave]

Go to your AdminCP > Plugins & Products > Plugin Manager > CTRL + F and search for process_templates_complete hooks.

For each match found click on edit and look around line 60 for =& or some function that makes use of old standards. Feel free to paste line 58-62 here so we can take a look.

Changing it to =& shouldn't deal any damage, vBulletin changed all =& to = in the latest vBulletin version if I recall correctly in order to support PHP 7.