What steps will reproduce the problem?

1. When i die

What version of ShestakUI are you using? (Stating 'latest' is not useful)

0.89

Do you have an error log of what happened?

Message: ...ibility\Classic\Libs\AceBucket-3.0\AceBucket-3.0.lua:209: attempt to index upvalue 'AceEvent' (a nil value)
Time: Sat Sep 28 00:01:15 2019
Count: 1
Stack: ...ibility\Classic\Libs\AceBucket-3.0\AceBucket-3.0.lua:209: attempt to index upvalue 'AceEvent' (a nil value)
...ibility\Classic\Libs\AceBucket-3.0\AceBucket-3.0.lua:209: in function UnregisterBucket' ...ibility\Classic\Libs\AceBucket-3.0\AceBucket-3.0.lua:233: in function UnregisterAllBuckets'
...ibility\Classic\Libs\AceBucket-3.0\AceBucket-3.0.lua:259: in function <...ibility\Classic\Libs\AceBucket-3.0\AceBucket-3.0.lua:258>
[C]: ?
...ccountant_Classic\Libs\AceAddon-3.0\AceAddon-3.0.lua:70: in function <...ccountant_Classic\Libs\AceAddon-3.0\AceAddon-3.0.lua:65>
...ccountant_Classic\Libs\AceAddon-3.0\AceAddon-3.0.lua:569: in function <...ccountant_Classic\Libs\AceAddon-3.0\AceAddon-3.0.lua:555>
(tail call): ?
(tail call): ?
...Classic\Libs\ThreatClassic-1.0\ThreatClassic-1.0.lua:775: in function ?' ...sic\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119: in function <...sic\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [C]: ? ...sic\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:29: in function <...sic\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> ...sic\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:64: in function Fire'
...ccountant_Classic\Libs\AceEvent-3.0\AceEvent-3.0.lua:120: in function <...ccountant_Classic\Libs\AceEvent-3.0\AceEvent-3.0.lua:119>

Locals:

Any additional information? (example: WoW language if not English) (Attach screenshots here if available, do not link externally)

language : Korean

Can you try disabling Accountant_Classic and let me know if the problem persists?

Also, can you try with the latest ShestakUI? Seems I didn't add the Ace library into the table of contents until just now which might have caused this conflict. Latest is now 0.90.

How did you know that I use Accountant?
I updated lasted version and disable Accountant but still error message.

I think it is not shestak error sry

I knew you used it since it says so in the error message you provided.

I just tried with ShestakUI 0.90 and Accountant_Classic from https://www.curseforge.com/wow/addons/accountant-classic/files/2779007, and was not able to reproduce any error upon dying when using the koKR locale.

Make sure that you fully restarted the client if you updated ShestakUI and didn't just overwrite the files and /reload, as I made changes that specifically required restarting the client. If you have done so and you're still getting the error, something else is at play that I cannot track down.

I did what you told me and it fixed!