I was using both Gladiator and Tattle, first I uninstalled both and only install Tattle, after installation, there are all EU and US BG folders in my addon folder, looks like /interface/addons/Gladiator_USXX, and in the Tattle folder, there are Gladiator_EU24 and US15 folders. I logged on, I got error message above. Then I tried to only install Gladiator since it includes Tattle, and same error.
Message: ..\AddOns\Tattle\Tattle.lua line 128:
No data. Your battlegroup's addon must be present, copy it from the Tattle folder yourself or run the included batch or shell file.