1x [ADDON_ACTION_BLOCKED] AddOn 'BagSync' tried to call the protected function 'SecureStateDriverManager:SetAttribute()'.
[string "@!BugGrabber\BugGrabber.lua"]:519: in function <!BugGrabber\BugGrabber.lua:519>
[string "=[C]"]: in function SetAttribute' [string "@FrameXML\SecureStateDriver.lua"]:10: in function <FrameXML\SecureStateDriver.lua:8> [string "=(tail call)"]: ? [string "@ElvUI\Core\Modules\UnitFrames\UnitFrames.lua"]:1097: in function CreateAndUpdateHeaderGroup'
[string "@ElvUI\Core\Modules\UnitFrames\UnitFrames.lua"]:1189: in function UpdateAllHeaders' [string "@ElvUI\Core\Modules\UnitFrames\UnitFrames.lua"]:966: in function HandleSmartVisibility'
[string "@ElvUI\Core\Modules\UnitFrames\UnitFrames.lua"]:971: in function ?' [string "@BagSync\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ync\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@BagSync\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ync\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@BagSync\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function Fire'
[string "@BagSync\libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <...ceBagSync\libs\AceEvent-3.0\AceEvent-3.0.lua:119>

BagSync didn't trigger the error ElvUI did if you look at the error report. Error was in function "CreateAndUpdateHeaderGroup" from in ElvUI. BagSync is being mentioned and blamed because it's higher in the Alphabet Mod Order. This is a known bug and issue with how Blizzard error reports. I suggest you report this to ElvUI. The error is in their UnitFrames.lua module.