From https://mods.curse.com/addons/wow/keystone-query?comment=4

Downloaded from curse client and getting this error. AceBucket is in the zip and folder ace3 so don't know what's wrong :(

Interface\AddOns\KeystoneQuery\KeystoneQuery-2.3.lua:1: Usage: EmbedLibrary(addon, libname, silent, offset): 'libname' - Cannot find a library instance of "AceBucket-3.0".
Time: 12/02/16 23:24:18
Count: 1
Stack: [C]: ?
...AddOns\ElvUI\Libraries\AceAddon-3.0\AceAddon-3.0.lua:220: in function `EmbedLibrary'
...AddOns\ElvUI\Libraries\AceAddon-3.0\AceAddon-3.0.lua:202: in function `EmbedLibraries'
...AddOns\ElvUI\Libraries\AceAddon-3.0\AceAddon-3.0.lua:169: in function `NewAddon'
Interface\AddOns\KeystoneQuery\KeystoneQuery.lua:1: in main chunk

Locals: (*temporary) = "Usage: EmbedLibrary(addon, libname, silent, offset): 'libname' - Cannot find a library instance of "AceBucket-3.0"."