Secondary pricelisr api error

Hi All,

I have created a item pricelist and attached to the customer bill_to using pricelist api. I am trying to add secondary pricelist to the pricelist i have created using qualifiers api. I am getting an unexpected error. Please let me know any issue with the script i am using and any help is appreciated.

 DECLARE

   gpr_return_status             VARCHAR2 (1) := NULL;

   gpr_msg_count                 NUMBER := 0;

   gpr_msg_data                  VARCHAR2 (2000);

   gpr_price_list_rec            QP_PRICE_LIST_PUB.Price_List_Rec_Type;

   gpr_price_list_val_rec        QP_PRICE_LIST_PUB.Price_List_Val_Rec_Type;

   gpr_price_list_line_tbl       QP_PRICE_LIST_PUB.Price_List_Line_Tbl_Type;