On Retail, with latest (alpha) version installed, this happens when logging in/reloading:

Message: Interface/AddOns/HandyNotes_Stygia/stygia.lua:13: attempt to call field 'RegisterPoints' (a nil value)
Time: Sat Nov 19 19:43:20 2022
Count: 1
Stack: Interface/AddOns/HandyNotes_Stygia/stygia.lua:13: attempt to call field 'RegisterPoints' (a nil value)
[string "@Interface/AddOns/HandyNotes_Stygia/stygia.lua"]:13: in main chunk

Locals: myname = "HandyNotes_Stygia"
ns =

{
hiddenConfig = {
}
}
(*temporary) = nil
(*temporary) = 1543
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}
(*temporary) = {
requires_item = 184870
inbag = 185474
group = "Stygia Nexus"
label = "Stygia Nexus"
quest = 63684
atlas = "vehicle-templeofkotmogu-greenball"
}
(*temporary) = "attempt to call field 'RegisterPoints' (a nil value)"