[tiomun]

I was able to make some progress on this just with trial and error.

Basically I Changed the function names to MMO_xxx() Insread of MMO.xxx(),
added local infront of each function,
and Removed the RegisterForEvent and added a simple function call to initialize at the end.

-- Default Saved Variables
MMO.defaults = {
    -- Bag
    OverideBag = true,
    -- Map
    OverideMap = true,
    -- ActionBar
    OverideActionBar = true,
    -- Mouse
    OverideMouse = true
    
}
 
local function MMO_Initialize()
 
    -- Register the slash command handler
    SLASH_COMMANDS[MMO.command] = MMO_Slash
        
    -- Load saved variables
    MMO.Vars = ZO_SavedVars:New( 'MMO_VARS' , math.floor( MMO.version * 100 ) , nil , MMO.defaults )
    
    if (MMO.Vars.OverideBag == true) then    
        MMO_bag()
    end
    
    --if (MMO_Vars.OverideActionBar == true) then    
        --MMO_actionbar()
    --end
    
end
 
local function MMO_Update()
 
end
 
local function MMO_Slash( text )
    MMO_Message()
end
 
local function MMO_Message()
    d( "You are using ".. MMO.name .. " version " .. MMO.version )
    d( MMO.name .. " configuration settings are in the game settings interface!" )
end
 
MMO_Initialize()

This worked well while I had the call to the functions MMO_bag() commented out much like MMO_actionbar() is commented out.

MMO_bag() is in a separate file functions.lua at the moment whether it has any code in the function or not it throws this new error

user:/AddOns/mmoui/mmoui.lua:23: function expected instead of nil stack traceback: user:/AddOns/mmoui/mmoui.lua:23: in function 'MMO_Initialize' user:/AddOns/mmoui/mmoui.lua:45: in function '(main chunk)'

and the code for function.lua

local function MMO_bag()
--[[--
    if BAG == nil then 
        local BAG = ZO_PlayerInventoryBackpack
        BAG:SetCenterColor(0,0,0,0.5)
        BAG:SetTexture(CT_BACKDROP)
        BAG:SetEdgeColor(.1,.1,.1,1)
        BAG:SetEdgeTexture("",8,1,2)
    end
--]]--
end

Theirs something different about lua that I cant wrap my head around. basic to php and most languages give me little trouble. I am definitely missing something with how the functions work, or variable get passed around. lua examples I see online look very little like what is used in these addons....