Interface/AddOns/RaiderIO/core.lua:1267: Raider.IO Config expects Get(key[, fallback]) to only be used after the addon saved variables have been loaded.
Count: 1

Call Stack:
[string "=[C]"]: ?
[string "=[C]"]: in function assert' [string "@Interface/AddOns/RaiderIO/core.lua"]:1267: in function Get'
[string "@Interface/AddOns/RaiderIO/core.lua"]:5726: in function <Interface/AddOns/RaiderIO/core.lua:5725>
[string "@Interface/AddOns/RaiderIO/core.lua"]:63: in function <Interface/AddOns/RaiderIO/core.lua:62>
[string "=[C]"]: ?
[string "@Interface/SharedXML/CallbackRegistry.lua"]:178: in function <Interface/SharedXML/CallbackRegistry.lua:177>
[string "=[C]"]: ?
[string "@Interface/SharedXML/CallbackRegistry.lua"]:181: in function TriggerEvent' [string "@Interface/SharedXML/Scroll/ScrollBox.lua"]:222: in function SetScrollTargetOffset'
[string "@Interface/SharedXML/Scroll/ScrollBox.lua"]:714: in function <Interface/SharedXML/Scroll/ScrollBox.lua:696>
[string "=[C]"]: in function Update' [string "@Interface/SharedXML/Scroll/ScrollBox.lua"]:135: in function <Interface/SharedXML/Scroll/ScrollBox.lua:129> [string "=[C]"]: in function GetWidth'
[string "@Interface/AddOns/NDui/Core/Functions.lua"]:1041: in function ReskinTrimScroll' [string "@Interface/AddOns/NDui/Modules/Skins/Blizzard/FrameXML/FriendsFrame.lua"]:144: in function func'
[string "@Interface/AddOns/NDui/Modules/Skins/Skins.lua"]:33: in function LoadAddOnSkins' [string "@Interface/AddOns/NDui/Modules/Skins/Skins.lua"]:60: in function OnLogin'
[string "@Interface/AddOns/NDui/Init.lua"]:136: in function `func'
[string "@Interface/AddOns/NDui/Init.lua"]:23: in function <Interface/AddOns/NDui/Init.lua:18>

Yep I've been getting this error as well as of recent, the error seems to go away when I disable NDui so there seems to be some kind of issue going on between NDui and raider.io addon but I'm not 100% sure what it could be..

Interface/AddOns/RaiderIO/core.lua:1267: Raider.IO Config expects Get(key[, fallback]) to only be used after the addon saved variables have been loaded.
Count: 1

Call Stack:
[string "=[C]"]: ?
[string "=[C]"]: in function `assert'
[string "@Interface/AddOns/RaiderIO/core.lua"]:1267: in function `Get'
[string "@Interface/AddOns/RaiderIO/core.lua"]:5726: in function <Interface/AddOns/RaiderIO/core.lua:5725>
[string "@Interface/AddOns/RaiderIO/core.lua"]:63: in function <Interface/AddOns/RaiderIO/core.lua:62>
[string "=[C]"]: ?
[string "@Interface/SharedXML/CallbackRegistry.lua"]:178: in function <Interface/SharedXML/CallbackRegistry.lua:177>
[string "=[C]"]: ?
[string "@Interface/SharedXML/CallbackRegistry.lua"]:181: in function `TriggerEvent'
[string "@Interface/SharedXML/Scroll/ScrollBox.lua"]:222: in function `SetScrollTargetOffset'
[string "@Interface/SharedXML/Scroll/ScrollBox.lua"]:714: in function <Interface/SharedXML/Scroll/ScrollBox.lua:696>
[string "=[C]"]: in function `Update'
[string "@Interface/SharedXML/Scroll/ScrollBox.lua"]:135: in function <Interface/SharedXML/Scroll/ScrollBox.lua:129>
[string "=[C]"]: in function `GetWidth'
[string "@Interface/AddOns/NDui/Core/Functions.lua"]:1041: in function `ReskinTrimScroll'
[string "@Interface/AddOns/NDui/Modules/Skins/Blizzard/FrameXML/FriendsFrame.lua"]:144: in function `func'
[string "@Interface/AddOns/NDui/Modules/Skins/Skins.lua"]:33: in function `LoadAddOnSkins'
[string "@Interface/AddOns/NDui/Modules/Skins/Skins.lua"]:60: in function `OnLogin'
[string "@Interface/AddOns/NDui/Init.lua"]:136: in function `func'
[string "@Interface/AddOns/NDui/Init.lua"]:23: in function <Interface/AddOns/NDui/Init.lua:18>

Should be issue on raider io. NDui never skin any parts from it.

Just to note that your fixes didn't actually fix the error that was mentioned above as running the latest version and it still throws the same error, but I had created an issue on raiderio github page a few weeks back and they came up with a solution as of recent made in this commit RaiderIO/raiderio-addon@dba042f which fixes the lua error (once it's actually pushed in the next addon update).