Quoted from "Keyshana;529854"
Just logging in will clear it. I do not, however, believe it is related to the log. I find it happens if I go to put an item into the chest, and put it in a slot already takein by something else. It immediately locks me out. To get past that, I just have started removing everything from the chest, to my bags, stacking there, and putting things back in the chest. I've not had that come up since.