WowAce

Decursive: There are too many Lua errors in your User Interface (14 errors). Your game experience may be degraded. Disable or update the failing add-ons to turn off this message.
You may want to turn on Lua error reporting (/console scriptErrors 1).
Decursive: Decursive is merely reporting the issue. So, don't shoot the messenger and address the actual problem.
Decursive: Last UI error: Interface\AddOns\DataStore_Stats\DataStore_Stats-6.0.002.lua:61: Usage: GetCombatRating(ratingIndex)

Verifying that the error that usul420 is reporting is also happening to me. The LUA errors cause WoW to be non-responsive.

This is a known error for a few months now ( when they enable addons on beta ) and still happening on live now.

I dont want to be insensitive, but with authors / owners like these this is getting tiring by the minute.

Im seriously thinking to not donate ever again.

Just blame the authors who don't update their addons and thank Decursive for letting you know that something is wrong and that your game experience is degraded...