Message: elvUI isn't registed with AceConfigRegistry, unable to open config
Time: Thu May 20 17:29:49 2021
Count: 1
Stack: elvUI isn't registed with AceConfigRegistry, unable to open config
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "@Interface\AddOns\ElvUI_OptionsUI\Libraries\Ace3\AceConfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua"] in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1963>
[string "=[C]"]: in function `?'
[string "@Interface\AddOns\elvUI\Core\Config.lua"] in function `?'
[string "@Interface\AddOns\elvUI\Libraries\Ace3\AceConsole-3.0\AceConsole-3.0.lua"]:94: in function `?'
[string "@Interface\FrameXML\ChatFrame.lua"]:4825: in function `ChatEdit_ParseText'
[string "@Interface\FrameXML\ChatFrame.lua"]:4488: in function `ChatEdit_SendText'
[string "@Interface\FrameXML\ChatFrame.lua"]:4524: in function <Interface\FrameXML\ChatFrame.lua:4520>
[string "=[C]"]: in function `ChatEdit_OnEnterPressed'
[string "*:OnEnterPressed"]:1: in function <[string "*:OnEnterPressed"]:1>

Locals:

ElvUI is ElvUI, not elvui. Capitalisation matters.

In your addons folder, rename your elvui folder back to ElvUI