[Vrul]

You have to move the "local AddOnList = {}" outside the do...end block or the rest of your code won't be able to see it.

local AddOnList = {}
do
    for i = 1, GetNumAddOns() do
        local folderName, title = GetAddOnInfo(i)
        if not exempt[folderName] then
            table.insert(AddOnList, {name = title})
        end
    end
    table.sort(AddOnList, function(a, b) -- sort alphabetically
        return a.name > b.name
    end)
end