Stored procs / functions - execution failure

Hi All,

I am having an issue with a function where it used to run in a previous
installation of postgres under windows. The box has since been
decommissioned so I am unable to check exactly what version it was though it
was version 8 under winxp.

I am now running postgres 8.2.5 Under OSX 10.5.3

Now I have imported the data, the function is available in the list however
I get this error when I try to run it

ERROR: function sp_schedulefromdate("unknown") does not exist
LINE 1: select sp_scheduleFromDate('2008-01-01');
^
HINT: No function matches the given name and argument types. You may need
to add explicit type casts.

********** Error **********

ERROR: function sp_schedulefromdate("unknown") does not exist
SQL state: 42883
Hint: No function matches the given name and argument types. You may need to
add explicit type casts.
Character: 8

The function code is as below

-- Function: "sp_scheduleFromDate"(date) -- DROP FUNCTION
"sp_scheduleFromDate"(date); CREATE OR REPLACE FUNCTION
"sp_scheduleFromDate"(date) RETURNS refcursor AS $BODY$declare v_date
alias for $1; v_rs cursor for select v.sitename,
... from v_schedule v where v.scheduledate =
v_date::text; begin open v_rs; return v_rs; end; $BODY$
LANGUAGE 'plpgsql' VOLATILE; ALTER FUNCTION "sp_scheduleFromDate"(date)
OWNER TO postgres; GRANT EXECUTE ON FUNCTION "sp_scheduleFromDate"(date) TO
public; GRANT EXECUTE ON FUNCTION "sp_scheduleFromDate"(date) TO postgres;
GRANT EXECUTE ON FUNCTION "sp_scheduleFromDate"(date) TO divequee_dmpro;

Any thoughts?

Damian