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Technically, that's a warning, not an error... it's a taint bug resulting from trying to show/hide/modify aura buttons while in combat and is a side effect of enabling the clickable option for the auras.
For the most part, it's an entirely benign error and likely has no impact on you in combat other than annoying the crap out of you when the error window is displayed. There's an option to turn off warning messages somewhere either in the bug tool or the Blizz interface, I forget which.
While it doesn't make the problem go away entirely, it will at least prevent it from annoying you in the middle of encounters.
That all said, the second most important priority I have in nUI6, other than performance fixes, it to fix all of the taint problems nUI5 had. Blizz is making some changes to how taint is reported in the 5.2 PTR and I'm anxiously waiting for that to all get working so I can nail down the last couple of taints I have to deal with in nUI6. I don't see them getting fixed in nUI5 since it's long been end of life and being kept on life support by Xrystal while I work on nUI6... it would be way too much work for far too little return to try and do it in nUI5.
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