I got that the other day, too.
I *think* it's because the gender wasn't checked. There are choices of male, female or undisclosed. I think because there was an undisclosed choice that maybe it was a required field now? whereas it didn't used to be? I didn't bother to check it and find out though.
But yeah, I got the same thing when I tried to change my location.
Give us this day our daily bacon.