Bug report. I was messing around with the plugin, and it initially didn't work. F12 console was giving the error "Uncaught SyntaxError: Unexpected end of JSON input."
After a bit of digging in the code, I found the issue was with errorManager. And when I figured out how to fix that, I got the same error with prereqSave. The reason the issue was happening is that default settings for the plugin leave these two fields as empty, which causes the processing of the settings to just give up on game start.
Reason the default settings are blank is because of the bane of all programmers, a stupid typo! Both of these plugin properties have "deafult" values instead of default values. Fixing the typo for both settings allowed the plugin to boot with no errors in the F12 console in a clean project with no settings changes.