What kind of error? Did you check that there are indeed 330 days within the qualifying period by your own calculation? If so, how does your calculation differ from what's in PS?
PS (as with other tax products) generally relies on your input to determine the qualifying period. If something in PPT is wrong, it usually lies with the input.
Still an AllStar
The solution seems to entail either waiting for a correctional update or delete the 2555