I decided to test this out on a cleanly installed test forum, and got the same thing. I'm pretty sure it's caused by version 2.2.5. The error was not brought about by a change in the global.php file, but rather one of the changes made by the functions.php file (which is also mentioned in the error).
Maybe at some point I'll try to figure out what is going on (I really want this script), but for now I would say not to install it on 2.2.5.
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