@demadog,
getExhaustionLevel is part of the built-in 5E ruleset. So, if you are still getting the error; it sounds like you might be running an old copy of the 5E ruleset.
In your FG data folder, under the rulesets folder, make sure you don't have any subfolders for any rulesets. If you don't, try deleting 5E.pak, and running a new Check for Updates.
Regards,
JPG

