Consider it done! (I included the default CCS file just for safety's sake; even though they're all fairly basic, it wouldn't surprise me if the absolute simplest CCS was what was breaking things.)
Well, since .CCS isn't considered a valid extension by the forum, I can't upload them as .CCS files. (Hence why I copy-and-pasted the contents of said files.)
I could stick them in a .ZIP, if that's okay.
I've got three, but they don't do anything out of the ordinary; one's the default (special action/attack with weapon), and the other two just execute Disco Combos (the first is DDoD/DD2/DD3/KITD, the second is DDoD/DD2/DD3/KIDT/DI).
DisCombobulation.ccs:
[ default ]
skill disco dance of doom...
Well, I just checked 17.12 again (after all, it doesn't hurt to be thorough), and I got the same error in the CLI.
Interestingly, the debug log for this iteration of the error is a lot more verbose:
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KoLmafia v17.12...
Got this error when trying to load the latest release version of KoL Mafia (v17.12 r18288). Exception log follows:
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KoLmafia v17.12 r18288, Windows 8.1, Java 1.8.0_60...