oracle - Oracle でパッケージを実行できません

Question

以下のパッケージがあります。

create or replace PACKAGE PKG_CONV_PRODUCT
AS
    PROCEDURE SP_LOAD_DATA;
    PROCEDURE SP_CREATE_BACKUP_TABLES (P_LOADING_ID IN CONV_LOAD_STATS.LOADING_ID%TYPE);
END PKG_CONV_PRODUCT;

また、パッケージ本体は次のとおりです。

create or replace PACKAGE BODY PKG_CONV_PRODUCT
AS
    GV_LOADING_ID PLS_INTEGER;

    TYPE TYP_TABLE_NAME
    IS
        TABLE OF USER_TABLES.TABLE_NAME%TYPE;
        TAB_TABLE_NAME TYP_TABLE_NAME := TYP_TABLE_NAME   ( 'PRODUCTS',
            'PRODUCT_GROUP_CODES',
            'PRODUCT_SUB_GROUPS',
            'PRODUCT_GROUP_CODES_LICENSES',
            'PRODUCTS_OBJECTIVES', 
            'PRODUCTS_HISTORY', 
            'PRODUCTS_BREAK_POINTS', 
            'PRODUCTS_LICENSES', 
            'PRODUCTS_CONCESSION_PERCENT', 
            'PRODUCTS_BD_STATUS') 

    PROCEDURE SP_LOAD_DATA
    IS
    BEGIN
        GV_LOADING_ID := SEQ_CONV_PRODUCT.NEXTVAL;
        SP_CREATE_BACKUP_TABLES (GV_LOADING_ID);
    END SP_LOAD_DATA;

    PROCEDURE SP_CREATE_BACKUP_TABLES(P_LOADING_ID IN CONV_LOAD_STATS.LOADING_ID%TYPE)
    IS
        L_TABLE_NAME VARCHAR2(50);
    BEGIN
        FOR INDX IN TAB_TABLE_NAME.FIRST .. TAB_TABLE_NAME.LAST
        LOOP
            L_TABLE_NAME := TAB_TABLE_NAME (INDX);
            IF(L_TABLE_NAME = 'PRODUCT_GROUP_CODES_LICENSES')  THEN  
                L_TABLE_NAME :='PROD_GRP_CODES_LICENSES';
            ELSIF(L_TABLE_NAME = 'PRODUCTS_CONCESSION_PERCENT')  THEN  
                L_TABLE_NAME :='PROD_CONCESSION_PERCENT';
            ELSIF(L_TABLE_NAME = 'SPONSORS_ADVISORY_APPROVAL')  THEN  
                L_TABLE_NAME :='SPON_ADVISORY_APPROVAL';
            END IF;

            EXECUTE IMMEDIATE 
                'CREATE TABLE BONUS.' ||
                SUBSTR ('BKP' || 
                P_LOADING_ID || 
                L_TABLE_NAME ,
                1,
                30)|| 
                ' TABLESPACE APP_TABLE AS SELECT * FROM BONUS.' ||
                L_TABLE_NAME ;

            EXECUTE IMMEDIATE 
                'GRANT SELECT ON BONUS.' || 
                SUBSTR ('BKP' || 
                P_LOADING_ID || 
                L_TABLE_NAME ,
                1, 
                30)|| 
                ' TO ROLE_BONUS_SELECT_SR01';
        END LOOP;
    END SP_CREATE_BACKUP_TABLES;
END PKG_CONV_PRODUCT;

そして、次のエラーが発生しました：

ORA-00955: name is already used by an existing object
ORA-06512: at "BONUS.PKG_CONV_PRODUCT", line 58
ORA-06512: at "BONUS.PKG_CONV_PRODUCT", line 40
ORA-06512: at line 2

これについて私を助けてもらえますか？