I just made a modpack (MPMPM) with RAS only and tried to open the singleplayer screen (without going to mods).
The setting screens are nearly empty and I get the following lua errors:
[778955.609] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\DataManager\GTAS_DataManager.lua:22: bad argument #2 to 'OpenUserData' (number expected, got nil)
[778955.609] AdvancedSetup: (Really Advanced Setup) Version: Unknown -------------------------------------------------------------------------------
[778955.625] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI Overrides\AdvancedSetup.lua:276: attempt to call global 'LoadData' (a nil value)
[778955.625] Runtime Error: Error loading Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI Overrides\AdvancedSetup.lua.
[778962.875] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_CivPanel.lua:20: attempt to index global 'SlotData' (a nil value)
[778967.281] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_CivBonusPanel.lua:209: attempt to index global 'GlobalData' (a nil value)
[778968.078] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_MapBonusPanel.lua:20: attempt to index global 'MapData' (a nil value)
[778968.765] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_MapPanel.lua:37: attempt to index global 'MapData' (a nil value)
[778970.984] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_GamePanel.lua:54: attempt to index global 'GameData' (a nil value)
[778974.390] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_GamePanel.lua:46: attempt to index global 'GameData' (a nil value)
[778976.453] Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI\Main\GTAS_CivPanel.lua:20: attempt to index global 'SlotData' (a nil value)
Maybe this does help you to make it MPMPM and multiplayer compatible
And maybe, if working on it, it would be good if the player can choose whether to use the original advanced setp, or the really advanced setup (because with a modpack your mod would be active all the time, so no choice like activate or not activate your mod)
In multiplayer screen your new setup is not shown, it seems to be the old one. I guess there are different files to mod. But I get:
Runtime Error: Assets\DLC\MP_MODSPACK\Mods\Really Advanced Setup (v 15)\UI Overrides\AdvancedSetup.lua:132: attempt to call global 'SaveData' (a nil value)