Another fix for update error that may work for some (worked for me after other fixes failed):
Turn off wifi > open app > hit retry at least 3 times > turn on wifi > once connected, click "return to title".
If it still fails, try closing and clearing cache before trying again
Turn off wifi > open app > hit retry at least 3 times > turn on wifi > once connected, click "return to title".
If it still fails, try closing and clearing cache before trying again