[2018/02/03 19:25:38-1990]: core\tooltip.lua:26: Invalid quest item in SetQuestLogItem("type", index)
: in function `?'
core\tooltip.lua:26: in function <Interface\AddOns\aux-addon\core\tooltip.lua:23>
:
:"EQL3_QuestLogItem1:OnEnter":4: in main chunk

A new error occurred when I pick up mail

[2018/03/08 11:40:46-2429]: core\tooltip.lua:152: Usage: GetItemQualityColor(index)
: in function GetItemQualityColor' core\tooltip.lua:152: in function <Interface\AddOns\aux-addon\core\tooltip.lua:147> core\tooltip.lua:26: in function <Interface\AddOns\aux-addon\core\tooltip.lua:21> <unknown>: FrameXML\MailFrame.lua:218: in function InboxFrameItem_OnEnter'
Mail\Mail.lua:169: in function `InboxFrameItem_OnEnter'
:"MailItem2Button:OnEnter":2: in main chunk

Could you try to find out if it's a conflict with some other addon and which?