This SQL script is not running properly

Question

The following is SQL script which I want to run.When I am running individual statements , all the statements are working. But When I am running script as a whole, its not working.
what might be the problem with following script
--the following table is created with list of Singapore Holidays
set define off
drop table exclude_date;
create table exclude_date as
select 2007 as year#, 1 month#, 1 day#, 'New Year Day' as name# from dual union all
select 2007 as year#, 1 month#, 2 day#, 'New Year Day' as name# from dual union all
select 2007 as year#, 2 month#, 18 day#, 'Chinese New Year' as name# from dual union all
select 2007 as year#, 2 month#, 19 day#, 'Chinese New Year' as name# from dual union all
select 2007 as year#, 2 month#, 20 day#, 'Chinese New Year' as name# from dual union all
select 2007 as year#, 4 month#, 6 day#, 'Good Friday' as name# from dual union all
select 2007 as year#, 5 month#, 1 day#, 'Labour Day' as name# from dual union all
select 2007 as year#, 5 month#, 31 day#, 'Vesak Day' as name# from dual union all
select 2007 as year#, 8 month#, 9 day#, 'National Day' as name# from dual union all
select 2007 as year#, 10 month#, 13 day#, 'Hari Raya Puasa' as name# from dual union all
select 2007 as year#, 11 month#, 8 day#, 'Deepavali' as name# from dual union all
select 2007 as year#, 12 month#, 20 day#, 'Hari Raya Hji' as name# from dual union all
select 2007 as year#, 12 month#, 25 day#, 'Christmas Day' as name# from dual ;
show errors;
drop type DateList;
--This statement creates type of DateList for the function all_date_list which return DateList
create or replace type DateList as table of date;
show errors;
--the following function returns list of working dates  between two dates excluding SAT , SUN and Singapore Holidays
drop function all_date_list;
create or replace function all_date_list(p_start date, p_end date)
RETURN DateList
PIPELINED
IS
curdate date:=p_start;
exclude number;
BEGIN
WHILE curdate <= p_end
LOOP
BEGIN
select 1
into exclude
from exclude_date
where to_date(year#||lpad(month#,2,0)||lpad(day#,2,0),'YYYYMMDD')=trunc(curdate) --excluding unworked days
or mod(to_char(curdate,'j'),7) in (5,6); --excluding week-end
EXCEPTION WHEN NO_DATA_FOUND THEN PIPE ROW( curdate );
WHEN OTHERS THEN NULL;
END;
curdate:=curdate+1;
END LOOP;
RETURN;
END;
show errors;
--the following function returns number of working days  between two dates excluding SAT , SUN and Singapore Holidays
drop function WorkingDays;
CREATE OR REPLACE function WorkingDays(msgSentDate Date) return NUMBER is
noOfWokingDays number;
begin
select count(*) into noOfWokingDays from table(all_date_list(msgSentDate,sysdate));
return noOfWokingDays;
end;
show errors;

Answer 1

--the following table is created with list of Singapore Holidays
set define off
drop table exclude_date;
create table exclude_date as
select 2007 as year#, 1 month#, 1 day#, 'New Year Day' as name# from dual union all
select 2007 as year#, 1 month#, 2 day#, 'New Year Day' as name# from dual union all
select 2007 as year#, 2 month#, 18 day#, 'Chinese New Year' as name# from dual union all
select 2007 as year#, 2 month#, 19 day#, 'Chinese New Year' as name# from dual union all
select 2007 as year#, 2 month#, 20 day#, 'Chinese New Year' as name# from dual union all
select 2007 as year#, 4 month#, 6 day#, 'Good Friday' as name# from dual union all
select 2007 as year#, 5 month#, 1 day#, 'Labour Day' as name# from dual union all
select 2007 as year#, 5 month#, 31 day#, 'Vesak Day' as name# from dual union all
select 2007 as year#, 8 month#, 9 day#, 'National Day' as name# from dual union all
select 2007 as year#, 10 month#, 13 day#, 'Hari Raya Puasa' as name# from dual union all
select 2007 as year#, 11 month#, 8 day#, 'Deepavali' as name# from dual union all
select 2007 as year#, 12 month#, 20 day#, 'Hari Raya Hji' as name# from dual union all
select 2007 as year#, 12 month#, 25 day#, 'Christmas Day' as name# from dual ;
drop type DateList;
create or replace type DateList as table of date;
--the following function returns list of working dates  between two dates excluding SAT , SUN and Singapore Holidays
drop function all_date_list;
create or replace function all_date_list(p_start date, p_end date)
RETURN DateList
PIPELINED
IS
curdate date:=p_start;
exclude number;
BEGIN
WHILE curdate <= p_end
LOOP
BEGIN
select 1
into exclude
from exclude_date
where to_date(year#||lpad(month#,2,0)||lpad(day#,2,0),'YYYYMMDD')=trunc(curdate) --excluding unworked days
or mod(to_char(curdate,'j'),7) in (5,6); --excluding week-end
EXCEPTION WHEN NO_DATA_FOUND THEN PIPE ROW( curdate );
WHEN OTHERS THEN NULL;
END;
curdate:=curdate+1;
END LOOP;
RETURN;
END;
show errors;
--the following function returns number of working days  between two dates excluding SAT , SUN and Singapore Holidays
drop function WorkingDays;
CREATE OR REPLACE function WorkingDays(msgSentDate Date) return NUMBER is
noOfWokingDays number;
begin
select count(*) into noOfWokingDays from table(all_date_list(msgSentDate,sysdate));
return noOfWokingDays;
end;
show errors;
commit;
The above script is not working properly.Last two fuctions are not executing.
What might be the error?