I picked up the new weekend quest for the week 8/15/2017-8/21/2917. After my first mythic the quest was gone out of my quest log, and I cannot pick it up in Dalaran.
Message: Interface\FrameXML\UnitPopup.lua:1803: attempt to index field '?' (a nil value)
Time: 04/12/17 00:00:35
Count: 1
Stack: Interface\FrameXML\UnitPopup.lua:1803: in function `SetRaidDifficulties'
Interface\FrameXML\UnitPopup.lua:1614: in function `func'
Interface\FrameXML\UIDropDownMenu.lua:791: in function `UIDropDownMenuButton_OnClick'
[string "*:OnClick"]:1: in function <[string "*:OnClick"]:1>

Locals: primaryRaid = false
difficultyID = 4
otherDifficulty = 0
otherDifficulty = 9
size = 25
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index field '?' (a nil value)"Now it's working fine. But a moment ago it wasn't.
Please Help.
Thanks !

I didn't find the right solution from the internet.
References:
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[Jiaz]

I think you are posting to the wrong forum?