When Turning on Weal Auras 2 with the Version: v8.3.0-12 of Hekili a scan event error stack happens. When I turn off line 1436 in the Hekili core it all works fine or if I turn off Weak Auras. As soon as weak auras loads the error happens. I am pasting the bug sack report in as well as posting images of the Bugsack report and the line I turned off in code.

2311x Hekili\Core.lua:1436: attempt to call field 'ScanEvents' (a nil value)
[string "@Hekili\Core.lua"]:1436: in function `ProcessHooks'
[string "@Hekili\UI.lua"]:825: in function <Hekili\UI.lua:689>

Locals:
self =

{
GetTTD = defined @Hekili\Targets.lua:654
DeserializeStyle = defined @Hekili\Options.lua:8591
modules = {
}
EmbedAbilityOptions = defined @Hekili\Options.lua:3463
Scripts = {
}
GetDeathClockByGUID = defined @Hekili\Targets.lua:639
After = defined @Hekili\Utils.lua:268
NewSpellInfo = true
Run = defined @Hekili\Hekili.lua:223
UpdateDisplayVisibility = defined @Hekili\UI.lua:1601
IsEnabled = defined @CanIMogIt\Libs\AceAddon-3.0\AceAddon-3.0.lua:451
KeybindInfo = {
}
RemoveHold = defined @Hekili\State.lua:5493
CreateCustomDisplay = defined @Hekili\UI.lua:1550
ToggleHold = defined @Hekili\State.lua:5518
Class = {
}
UpdateUseItems = defined @Hekili\Events.lua:558
SetSpecOption = defined @Hekili\Options.lua:3377
GetDefaults = defined @Hekili\Options.lua:521
dumpKeyCache = {
}
SetEnabledState = defined @CanIMogIt\Libs\AceAddon-3.0\AceAddon-3.0.lua:424
GetDisplayByName = defined @Hekili\Core.lua:1076
Options = {
}
ReInitialize = defined @Hekili\Core.lua:172
npUnits = {
}
GetAbilityInfo = defined @Hekili\Classes.lua:4870
State = {
}
OnEnable = defined @Hekili\Core.lua:195
RestoreDefault = defined @Hekili\Classes.lua:748
CmdLine = defined @Hekili\Options.lua:8329
IsDisplayActive = defined @Hekili\UI.lua:1698
ImporterData = {
}
ShowDiagnosticTooltip = defined @Hekili\UI.lua:2277
Notify = defined @Hekili\Options.lua:9214
OnInitialize = defined @Hekili\Core.lua:63
NewModule = defined @CanIMogIt\Libs\AceAddon-3.0\AceAddon-3.0.lua:235
GetErrors = defined @Hekili\Utils.lua:41
SetPackShareOption = defined @Hekili\Options.lua:3361
CreateButton = defined @Hekili\UI.lua:1736
ReleaseHolds = defined @Hekili\State.lua:5550
Deserialize = defined @BugSack\Libs\AceSerializer-3.0\AceSerializer-3.0.lua:246
SaveDebugSnapshot = defined @Hekili\Hekili.lua:292
SetSpecPref = defined @Hekili\Options.lua:3416
GetName = defined @CanIMogIt\Libs\AceAddon-3.0\AceAddon-3.0.lua:279
GetOptions = defined @Hekili\Options.lua:7560
GetSpec = defined @Hekili\Classes.lua:5179
SerializeDisplay = defined @Hekili\Options.lua:8488
name = "Hekili"
ExpireTTDs = defined @Hekili\Targets.lua:844
GetEncounterList = defined @Hekili\Options.lua:72
NewSpecialization = defined @Hekili\Classes.lua:790
Disable = defined @CanIMogIt\Libs\AceAddon-3.0\AceAddon-3.0.lua:314
GetOption = defined @Hekili\Options.lua:7905
auditInterval = 5.533000
GetNextPrediction = defined @Hekili\Core.lua:1004
currentSpec = {
}
Print = defined @CanIMogIt\Libs\AceConsole-3.0\AceConsole-3.0.lua:54
DumpFrameInfo = defined @Hekili\Core.lua:1486
ImportSimcAPL = defined @Hekili\Options.lua:3160
SetOption = defined @Hekili\Options.lua:8032
mt_default_totem = <

You have WeakAuras for Classic installed on Retail. Check your chatbox.

I'll be babyproofing this in the future, but you'll be fine if you just install the correct WeakAuras now.