Why do I get this error? ORA-00932: inconsistent datatypes

Question

This is my stored procedure I've created to select only the exact amount of records per page for a GridView (for ASP.NET):
CREATE OR REPLACE
PROCEDURE SELECT_COMMAND
(pTable IN VARCHAR2
, pFields IN VARCHAR2
, pSortField IN VARCHAR2
, pPageIndex IN NUMBER
, pTotalRecs IN NUMBER
, pResultSet OUT SYS_REFCURSOR
) AS
BEGIN 
  EXECUTE IMMEDIATE
  'SELECT ' || pFields || ' FROM '
  || '(SELECT '|| pFields ||', ROW_NUMBER() OVER(ORDER BY '|| pSortField ||') ROW_NUM '
  || 'FROM '|| pTable ||') WHERE ROW_NUM BETWEEN '|| to_char(pPageIndex*pTotalRecs) ||' AND '
  || to_char((pPageIndex+1)*pTotalRecs)   
  INTO pResultSet;
  -- Plus 1 to our index because GridView is a zeroth index collection
END SELECT_COMMAND;I then do a test case with the following paremeters:
declare
p_test sys_refcursor;
begin
select_command('v_sig_devices', '"JOB", "LINE"', '"DEVICE_ID"', 0, 10, p_test);
end;But I get the following error:
>
Error report: ORA-00932: inconsistent datatypes: expected - got -
ORA-06512: at "SIM.SELECT_COMMAND", line 10
ORA-06512: at line 4
00932. 00000 - "inconsistent datatypes: expected %s got %s"
>
At first Oracle gave me an error because the numbers were not a string. Then I convert them into a string (with to_char) and Oracle is still not happy! Any ideas as to why this is happening?
Thanks for any help that you can provide.

Answer 1

You don't select into ref cursors, you open them:
SQL> create table t(c varchar2(1));
Table created.
SQL> insert into t values ('a');
1 row created.
SQL> insert into t values ('b');
1 row created.
SQL> insert into t values ('c');
1 row created.
SQL> commit;
Commit complete.
SQL> create or replace
  2  procedure p (p_ref out sys_refcursor) as
  3  begin
  4     open p_ref for 'select c from t';
  5  end;
  6  /
Procedure created.
SQL> var results refcursor
SQL> exec p(:results);
PL/SQL procedure successfully completed.
SQL> print results
C
a
b
c