It says ATT so I am guessing it's from here but not 100% sure. Its under a separate folder that says attclassic. I get the error as the loading screen is logging me and and before I do anything. If its not All the Things I am sorry I put it here just trying to figure it out.

29x ATT-Classic\Settings-Settings.lua:245: attempt to index global 'ATTClassicSettings' (a nil value)
ATT-Classic\Settings-Settings.lua:245: in function `GetTooltipSetting'
ATT-Classic\ATT-Classic-0.1.2.lua:6316: in function <ATT-Classic\ATT-Classic.lua:6315>
ATT-Classic\ATT-Classic-0.1.2.lua:6332: in function <ATT-Classic\ATT-Classic.lua:6331>

Locals:
self = ATT-Classic-Settings {
0 =
cancel = defined @FrameXML\InterfaceOptionsFrame.lua:614
CreateCheckBox = defined @ATT-Classic\Settings.lua:273
GetShortModeString = defined @ATT-Classic\Settings.lua:232
AUDIO_FANFARE_TABLE =

{
}
AUDIO_DEATH_TABLE = {
}
GetPersonal = defined @ATT-Classic\Settings.lua:241
logo = {
}
CreateTab = defined @ATT-Classic\Settings.lua:281
SetDebugMode = defined @ATT-Classic\Settings.lua:306
refresh = defined @FrameXML\InterfaceOptionsFrame.lua:616
Open = defined @ATT-Classic\Settings.lua:43
LocationsSlider = ATTLocationsSlider {
}
GetModeString = defined @ATT-Classic\Settings.lua:194
MiniListScaleSlider = ATTMiniListScaleSlider {
}
name = "ATT-Classic"
Initialize = defined @ATT-Classic\Settings.lua:147
GetTooltipSetting = defined @ATT-Classic\Settings.lua:244
MainListScaleSlider = ATTMainListScaleSlider {
}
classdefaults = {
}
MinimapButtonSizeSlider = ATTMinimapButtonSizeSlider {
}
SetTooltipSetting = defined @ATT-Classic\Settings.lua:256
community = {
}
SetCollectedThings = defined @ATT-Classic\Settings.lua:332
ShowCopyPasteDialog = defined @ATT-Classic\Settings.lua:294
default = defined @FrameXML\InterfaceOptionsFrame.lua:615
PrecisionSlider = ATTPrecisionSlider {
}
AUDIO_RAREFIND_TABLE = {
}
SetAccountMode = defined @ATT-Classic\Settings.lua:298
GetFilter = defined @ATT-Classic\Settings.lua:191
twitch = {
}
SetHideBOEItems = defined @ATT-Classic\Settings.lua:340
SetCompletedThings = defined @ATT-Classic\Settings.lua:315
version = {
}
title = {
}
okay = defined @FrameXML\InterfaceOptionsFrame.lua:613
UpdateMode = defined @ATT-Classic\Settings.lua:352
AUDIO_COMPLETE_TABLE = {
}
ToggleBOEItems = defined @ATT-Classic\Settings.lua:349
ToggleCollectedThings = defined @ATT-Classic\Settings.lua:337
Set = defined @ATT-Classic\Settings.lua:247
ToggleDebugMode = defined @ATT-Classic\Settings.lua:312
Refresh = defined @ATT-Classic\Settings.lua:265
SetPersonal = defined @ATT-Classic\Settings.lua:261
Tabs = {
}
SetCompletedGroups = defined @ATT-Classic\Settings.lua:324
ToggleCompletedThings = defined @ATT-Classic\Settings.lua:321
AUDIO_REMOVE_TABLE = {
}
SetFilter = defined @ATT-Classic\Settings.lua:251
ToggleAccountMode = defined @ATT-Classic\Settings.lua:303
ToggleCompletedGroups = defined @ATT-Classic\Settings.lua:329
MostRecentTab = ATT-Classic-Settings-Tab5 {
}
Get = defined @ATT-Classic\Settings.lua:188
}
setting = "Auto:MiniList"
(*temporary) = nil