Not sure if this is an Attune or Atlasloot problem. Found by BugSack on login

1x ...aceAttune\Libs\AceEvent-3.0\AceEvent-3.0-4.lua:33: Attempt to register unknown event "PARTY_MEMBERS_CHANGED"
[string "=[C]"]: in function RegisterEvent' [string "@Attune\Libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:33: in function OnUsed'
[string "@AtlasLootClassic\Libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:142: in function RegisterEvent' [string "@Prat-3.0-3.9.1\modules\PlayerNames.lua"]:1132: in function OnModuleEnable'
[string "@Prat-3.0-3.9.1\addon\modules.lua"]:189: in function <Prat-3.0\addon\modules.lua:178>
[string "=[C]"]: ?
[string "@attune\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:70: in function <...aceAttune\Libs\AceAddon-3.0\AceAddon-3.0.lua:65>
[string "@attune\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:527: in function EnableAddon' [string "@Attune\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:540: in function EnableAddon'
[string "@attune\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:630: in function <...aceAttune\Libs\AceAddon-3.0\AceAddon-3.0.lua:615>