On Retail (11.0.2), using SM v11.0.0.2...

1x SimpleMacro/SimpleMacro.lua:62: attempt to call method 'LoadSettings' (a nil value)
[string "@SimpleMacro/SimpleMacro.lua"]:62: in function <SimpleMacro/SimpleMacro.lua:40>

Locals:
self = SimpleMacro {
settings =

{
}
SettingsCategory = {
}
dbc = {
}
dba = {
}
}
event = "ADDON_LOADED"
arg1 = "SimpleMacro"
gt = {
groups = {
}
}
(*temporary) = nil
(*temporary) = SimpleMacroSettings {
}
(*temporary) = "attempt to call method 'LoadSettings' (a nil value)"
addonName = "SimpleMacro"
C = {
CONDITIONAL_EDITOR = {
}
CREATE_FRAME = {
}
MACRO_FRAME = {
}
MACRO_EDITOR = {
}
SETTINGS = {
}
CHANGE_FRAME = {
}
GROUP_FRAME = {
}
tabs = {
}
}