From the Darkshore WQ.

Message: [ADDON_ACTION_BLOCKED] AddOn 'Neuron' tried to call the protected function 'NeuronPetButton1:SetAttribute()'.
Time: Thu Jul 26 09:01:35 2018
Count: 1
Stack: [ADDON_ACTION_BLOCKED] AddOn 'Neuron' tried to call the protected function 'NeuronPetButton1:SetAttribute()'.
Interface\AddOns\Neuron\Neuron-Bars.lua:1863: in function `UpdateObjectVisibility'
Interface\AddOns\Neuron\Bar-Modules/Neuron-Pet.lua:426: in function <Interface\AddOns\Neuron\Bar-Modules/Neuron-Pet.lua:426>

Locals:

This is fixed

I've also seen this a few times on my hunter, not sure what's happening at the time to cause it, though, it's not happening often enough to have caught the pattern.

Ya fortunately these aren't lua erros, just taint warnings. But I need to fix them anyhow. Neuron has SO MANY taint warnings

Advice to work around the issue for now: use BugSack so the messages don't appear intrusively while you're playing, and instead are logged in BugSack for easy viewing later.

The above error is a taint error and as such would only visibly show if they were using something like bugsack already :-)