If you are a simple user from 2020 and have same problem, for example
"user:/AddOns/GearSetsSort/GearSetsSort.lua:328: Cannot find a library instance of "LibAddonMenu-2.0".
where is a fix:
change line in GearSetsSort.lua file
from " local LAM = LibStub('LibAddonMenu-2.0') " to "local LAM = LibAddonMenu2".
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