What steps will reproduce the problem?
1. /show recount
2.brings up that error code
3.

Message: Interface\AddOns\Recount\Recount.lua:447 attempt to index field 'MainWindow' (a nil value)
Time: 02/10/16 01:10:30
Count: 2
Stack: Interface\AddOns\Recount\Recount.lua:447 in function <Interface\AddOns\Recount\Recount.lua:446
(tail call): ?
...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:143 in function <...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:133
...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:408 in function <...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:334
(tail call): ?
...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:769 in function `HandleCommand'
...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:781 in function `?'
Interface\FrameXML\ChatFrame.lua:4454 in function `ChatEdit_ParseText'
Interface\FrameXML\ChatFrame.lua:4108 in function `ChatEdit_SendText'
Interface\FrameXML\ChatFrame.lua:4147 in function `ChatEdit_OnEnterPressed'
[string "*:OnEnterPressed"]:1: in function <[string "*:OnEnterPressed"]:1>

Locals: (*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index field 'MainWindow' (a nil value)"
Recount = <table> {
 SetMainWindowModeByLabel = <function> defined @Interface\AddOns\Recount\Recount_Modes.lua:807
 ResetData = <function> defined @Interface\AddOns\Recount\Recount.lua:783
 ResetPositionAllWindows = <function> defined @Interface\AddOns\Recount\WindowOrder.lua:129
 modules = <table> {
 }
 FormatLongNums = <function> defined @Interface\AddOns\Recount\GUI_Main.lua:80
 srcRetention = false
 SpellBuildingDamage = <function> defined @Interface\AddOns\Recount\Tracker.lua:515
 FlagSync = <function> defined @Interface\AddOns\Recount\LazySync.lua:531
 GetInheritGuardian = <function> defined @Interface\AddOns\Recount\Recount.lua:1055
 UnregisterTracking = <function> defined @Interface\AddOns\Recount\Tracker.lua:2449
 CheckPartyCombatWithPets = <function> defined @Interface\AddOns\Recount\roster.lua:18
 InitFightData = <function> defined @Interface\AddOns\Recount\Recount.lua:863
 RequestVersion = <function> defined @Interface\AddOns\Recount\LazySync.lua:613
 SpellAuraRefresh = <function> defined @Interface\AddOns\Recount\Tracker.lua:802
 UpdateZoneGroupFilter = <function> defined @Interface\AddOns\Recount\zonefilters.lua:78
 BossFound = <function> defined @Interface\AddOns\Recount\Tracker.lua:1686
 InGroup = <function> defined @Interface\AddOns\Recount\Recount.lua:1112
 ScheduleTimer = <function> defined @Interface\AddOns\GuildManager\Libs\AceTimer-3.0\AceTimer-3.0.lua:92
 SetStrataAndClamp = <function> defined @Interface\AddOns\Recount\WindowOrder.lua:163
 ShortNumber = <function> defined @Interface\AddOns\Recount\GUI_Main.lua:51
 FreeTableRecurse = <function> defined @Interface\AddOns\Recount\Recount.lua:1817
 FreeComm = <function> defined @Interface\AddOns\Recount\LazySync.lua:527
 db = <table> {
 }
 SetZoneGroupFilter = <function> defined @Interface\AddOns\Recount\zonefilters.lua:56
 UnregisterAllComm = <function> defined @Interface\AddOns\DBM-Core\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:200
 SetEnabledState = <function> defined @Interface\AddOns\GuildManager\Libs\AceAddon-3.0\AceAddon-3.0.lua:455
 ReportVersions = <function> defined @Interface\AddOns\Recount\Recount.lua:751
 CreateColorDropdown = <function> defined @Interface\AddOns\Recount\GUI_Realtime.lua:168
 ResetFightData = <function> defined @Interface\AddOns\Recount\Recount.lua:845
 SpellMissed = <function> defined @Interface\AddOns\Recount\Tracker.lua:632
 SetDeathLogDetails = <function> defined @Interface\AddOns\Recount\GUI_Detail.lua:481
 FindTargetedUnit = <function> defined @Interface\AddOns\Recount\roster.lua:86
 SpellAuraRemoved = <function> defined @Interface\AddOns\Recount\Tracker.lua:850
 NewModule = <function> defined @Interface\AddOns\GuildManager\Libs\AceAddon-3.0\AceAddon-3.0.lua:266
 IsBoss = <function> defined @Interface\AddOns\Recount\Tracker.lua:401
 GetLazySyncAmount = <function> defined @Interface\AddOns\Recount\LazySync.lua:655
 CreateFilt

What is the expected output? What do you see instead?
nothing just that error code (lua code)

What version of the product are you using?
6.2.3h

Do you have an error log of what happened?
yep already read that^^ - beginning of ticket

Please provide any additional information below.
please help :)