8x FreeInstanceSharer\Config.lua:236: attempt to concatenate field 'NAME - The name and realm of current character.' (a boolean value)
FreeInstanceSharer\Config.lua:236: in main chunk

Locals:
addonName = "FreeInstanceSharer"
addon =

{
Core = {
}
L = {
}
}
Core = {
SetDefaultModuleLibraries = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:367
Enable = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:294
UnregisterAllEvents = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:174
PLAYER_CAMPING = defined @FreeInstanceSharer\FreeInstanceSharer.lua:313
EnableModule = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:332
modules = {
}
GetModule = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:210
IterateEmbeds = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:442
defaultModuleLibraries = {
}
TimeLeft = defined @ace3\AceTimer-3.0\AceTimer-3.0.lua:172
CHAT_MSG_BN_WHISPER = defined @FreeInstanceSharer\FreeInstanceSharer.lua:333
CHAT_MSG_PARTY = defined @FreeInstanceSharer\FreeInstanceSharer.lua:385
ScheduleRepeatingTimer = defined @ace3\AceTimer-3.0\AceTimer-3.0.lua:129
CancelAllTimers = defined @ace3\AceTimer-3.0\AceTimer-3.0.lua:160
SetDefaultModulePrototype = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:409
name = "FreeInstanceSharer"
GROUP_ROSTER_UPDATE = defined @FreeInstanceSharer\FreeInstanceSharer.lua:355
IsEnabled = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:451
orderedModules = {
}
ScheduleTimer = defined @ace3\AceTimer-3.0\AceTimer-3.0.lua:94
DisableModule = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:350
inviteToGroup = defined @FreeInstanceSharer\FreeInstanceSharer.lua:256
CHAT_MSG_WHISPER = defined @FreeInstanceSharer\FreeInstanceSharer.lua:320
UPDATE_INSTANCE_INFO = defined @FreeInstanceSharer\FreeInstanceSharer.lua:288
addToQueue = defined @FreeInstanceSharer\FreeInstanceSharer.lua:209
RegisterMessage = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:90
UnregisterMessage = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:153
RegisterBucketEvent = defined @ace3\AceBucket-3.0\AceBucket-3.0.lua:184
removeFromQueue = defined @FreeInstanceSharer\FreeInstanceSharer.lua:242
leaveGroup = defined @FreeInstanceSharer\FreeInstanceSharer.lua:274
format = defined @FreeInstanceSharer\FreeInstanceSharer.lua:197
RegisterBucketMessage = defined @ace3\AceBucket-3.0\AceBucket-3.0.lua:200
IsModule = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:468
OnUpdate = defined @FreeInstanceSharer\FreeInstanceSharer.lua:151
SendMessage = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:59
OnEnable = defined @FreeInstanceSharer\FreeInstanceSharer.lua:125
debug = defined @FreeInstanceSharer\FreeInstanceSharer.lua:56
SetEnabledState = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:424
UnregisterAllBuckets = defined @ace3\AceBucket-3.0\AceBucket-3.0.lua:229
enabledState = true
addonPrefix = "|cFF70B8FFFreeInstanceSharer|r:"
RegisterEvent = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:90
UnregisterAllMessages = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:174
UnregisterBucket = defined @ace3\AceBucket-3.0\AceBucket-3.0.lua:206
printStatus =

i downgrade to 8.1.1
deleted the Zh Locales
edit the FreeInstanceSharer.Lua
line 66 :
local defaultConfig = {
["debug"] = false, -- Debug mode
["enable"] = false, -- Enable
["inviteOnly"] = false, -- Invite Only Mode
["preventAFK"] = false, -- Prevent AFK

and its work without any issues

Updated locale again, it should work this time.

I think unchecking Prevent AFK in config should allow logging out. Is it still failing?
It is a workaround as Blizzard don't allows addons to click cancel logout button, but if an error happens, the logout will be interrupted, then we can stop logging out due to long time afk. That's why you will see the error.