Unable to track Acheivements

[xkevzarx]

I am unable to track any Achievements. I get "You dont have space to track anymore objectives, stop tracking some first." I have turned all addons I use off except an addon called Addon Control Panel ver. 3.1.0.17, nUI. nUI: Config (GUI) and nUI:diamondplatecon. Every toon I use nUI with has this problem. My main raiding toon does not use nui as of yet and does not have this problem.