WowAce

Date: 2018-11-05 11:38:59
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\Grid2\GridLayout.lua line 381:
attempt to perform arithmetic on field '?' (a nil value)
Debug:
Grid2\GridLayout.lua:381: AddHeader()
Grid2\GridLayout.lua:366: LoadLayout()
Grid2\GridLayout.lua:348: ReloadLayout()
Grid2\GridLayout.lua:215: ?()
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:119:
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:119
[C]: ?
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:29:
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:25
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:64: SendMessage()
Grid2\GridRoster.lua:197: GroupChanged()
Grid2\GridRoster.lua:149: ?()
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:119:
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:119
[C]: ?
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:29:
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:25
...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:64: Fire()
Ace3\AceEvent-3.0\AceEvent-3.0.lua:120:
Ace3\AceEvent-3.0\AceEvent-3.0.lua:119
Locals:
None

i had the same error when it switched to old personal layout. 

delete the old layout and re-create a same layout then the error is gone.

Umm, your custom layouts must have a lot of years, I removed a conversion of ancient layout format in this version.

Bug not fixed due to a new bug in the code added to fix the bug, must be really fixed in v844