i am trying to add a new category in my store but i face this error when i try to save the category :
what i have figured out till now is that the "Available product listing sort by" option is missing in my display settings tab.
I have attached a screen shot for your reference any help is appriciated...
if any one could tell me how could i get this option to display,
p.s: the option is showing with the old added categories but not showing when i am trying to add a new category.