At this point with a single error, there isn't anything to really worry about. It could be a lot of different things. If you continue to get the errors and nobody else is seeing errors here or on the WCG boards then you might want to take a look at your overclock. Another thing is that you just might need to clean the dust out of your computer. A good overclock with clean filters, fans and heatsinks might not be any good after a few months of dust accumulation.