ERROR xxx: The coupon you entered is not valid

Hi, i receive always that error if i try to use a coupon generated by Awo Coupon pro or Hikashop.
If i disable the Awo Coupon Plugin all working fine.
I need that plugin to enable multi coupon on cart.
I have latest version of Hikashop Business , Joomla and Awo Coupon.
regards
Stefano

Solved, the coupon had only allowed for registered users and not for users Super User.
Stefano