Julien: Thanks for the info about the other senders. Haven’t tried CNCjs yet. Mostly wanted CarbideMotion so I could start using the probe capability.
The Carbide version of config.h that I found does not include DEFAULTS_SHAPEOKO_3
anywhere. Maybe I have an older version?
Neil: I found the Carbide version of config.h here:
The link is from 2/17 though. Don’t know if the file itself is that old or not. Again, when I did a diff between the link config.h and the standard 1.1 version, I saw a bunch of differences; not just the PARKING lines.
Thanks for the link to the other Forum thread; it looks like the same problem.
So this time I replaced the original config.h file with the Carbide one from the link, recompiled the sketch in the Arduino IDE, and flashed the EPROMs. Now when I open Carbide Motion I no longer see the error. 
So the answer is to use the correct (Carbide) config.h file and all is sunshine and unicorns.
Thanks for all the help!