ArgumentException: No widget mapping for the specified menu

As title suggests, this is error i get when trying to manage menus in Emporium. We had issue on server where HDD was full, after freeing space (unrelated to nopcommerce or folder of that site), all configuration disappeared. We managed to configure every plugin except mega menu. We have standing mirror of site on same server and everything is working as it should (no configuration was wiped and every plugin works as it should). Please help, its urgent.

You can try to delete the Mega Menu that you have and create a new one with the same menu items.