My apologies then, with my limited LUA knowledge, the only way to debug was to load/unload addon until the error went away.
After googling, according to this ticket on curse forge, lib heal com is no longer needed as of 4.0.1 but apparently it got installed by either grid of shadowed unit frames at one point.
http://www.wowace.com/addons/libheal...oken-in-4-0-1/
Thanks!
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