WowAce

I'm getting the following error as soon as the game loads:

Message: ...ce\AddOns\Chatter\Libs\AceEvent-3.0\AceEvent-3.0.lua:33: Attempt to register unknown event "UNIT_POWER"
Time: Fri Aug 23 08:07:57 2019
Count: 1
Stack: ...ce\AddOns\Chatter\Libs\AceEvent-3.0\AceEvent-3.0.lua:33: Attempt to register unknown event "UNIT_POWER"
[C]: in function `RegisterEvent'
...ce\AddOns\Chatter\Libs\AceEvent-3.0\AceEvent-3.0.lua:33: in function `OnUsed'
...ter\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:142: in function `RegisterEvent'
Interface\AddOns\Quartz_Power\Quartz_Power.lua:163: in function <Interface\AddOns\Quartz_Power\Quartz_Power.lua:161>
[C]: ?
...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:70: in function <...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:65>
...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:527: in function `EnableAddon'
...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:540: in function `EnableAddon'
...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:620: in function <...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:605>
[C]: ?
[C]: in function `LoadAddOn'
Interface\FrameXML\UIParent.lua:450: in function `UIParentLoadAddOn'
Interface\FrameXML\UIParent.lua:569: in function `TimeManager_LoadUI'
Interface\FrameXML\UIParent.lua:1210: in function <Interface\FrameXML\UIParent.lua:1108>

Locals: <none>