I dont have any error codes or anything but guildbank possibly needs an update, I usually get interface addon bugs from Pet tracker, but this time it is from Bagnon guildbank, in order for my interface actions to work correctly blizz popped up a box advising to disable this part of the bagnon addon, not the whole thing, so it's just a problem with the guild bank feature

I just turned the guild bank piece of Bagnon back on after today's update, and the guild bank appears to be functioning correctly.