When entering the bank in the Great Seal (subzone The Royal Treasury). Once triggered, it continues to be thrown on a wide variety of actions, some of which have nothing to do with BfA, until a reload.

15x ...s\HandyNotes_BattleForAzerothAchievments_Handler.lua:58: attempt to call global 'GetAtlasInfo' (a nil value) [string "@HandyNotes_BattleForAzerothAchievments\HandyNotes_BattleForAzerothAchievments_Handler.lua"]:58: in function <...s\HandyNotes_BattleForAzerothAchievments_Handler.lua:57> [string "@HandyNotes_BattleForAzerothAchievments\HandyNotes_BattleForAzerothAchievments_Handler.lua"]:115: in function <...s\HandyNotes_BattleForAzerothAchievments_Handler.lua:112> [string "@HandyNotes_BattleForAzerothAchievments\HandyNotes_BattleForAzerothAchievments_Handler.lua"]:179: in function <...s\HandyNotes_BattleForAzerothAchievments_Handler.lua:176> [string "@HandyNotes_BattleForAzerothAchievments\HandyNotes_BattleForAzerothAchievments_Handler.lua"]:408: in function (for generator)'
[string "@HandyNotes\HandyNotes-v1.6.1.lua"]:433: in function <HandyNotes\HandyNotes.lua:419>
[string "=[C]"]: ?
[string "@HandyNotes\HandyNotes-v1.6.1.lua"]:56: in function <HandyNotes\HandyNotes.lua:51>
[string "@HandyNotes\HandyNotes-v1.6.1.lua"]:483: in function ?' [string "@TomTom\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@TomTom\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@TomTom\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function Fire'
[string "@GatherMate2\Libs\HereBeDragons\HereBeDragons-2.0-15.lua"]:271: in function <...GatherMate2\Libs\HereBeDragons\HereBeDragons-2.0.lua:254>
[string "@GatherMate2\Libs\HereBeDragons\HereBeDragons-2.0-15.lua"]:301: in function <...GatherMate2\Libs\HereBeDragons\HereBeDragons-2.0.lua:300>`

This is a bug report for a different addon, with an admittedly similar name.