IMPORTANT : Your are using older version of WP Armour Lite (Free Version). Please update to 1.9 or above for it to work properly.
This came up right after I installed the update of Armour Lite, which took it from 1.9.2 to 1.10 — I have WP Armour Extended also, which is presumably what’s posting the warning. I’m guessing the logic is not coming out right that 1.10 IS a higher version than 1.9.0. A fix would be appreciated.