Im also getting the same error for months now every now, same on every stable/BETA build I have used and all the different trinity/QT versions along with different version of the profiles I have been using, so it cant be related to that. Problem is that eventually this issue/error ends up making D3 stop working. I suspect it has something to do with legendary in some way or another. Have no idea why and no one have commented on it, just have to live with it.