isqlplus, calling stored procedure with cursor

Hi
  I can call any stored procedure in sqlplus via a script using syntax like this

variable C refcursor;

declare

                pARG NUMBER := 18;
begin
myproc(:C, pARG)
end;
/
print C

Although I can upload this script using isqlplus it doesn't work, possibly because its
expecting something that could be run via 'ed'? How could I get the equilvilent working in
isqlplus? (message included below)

thanks

declare
*

ERROR at line 1:
ORA-01861: literal does not match format string ORA-06512: at line 4
ERROR:
ORA-24338: statement handle not executed SP2-0625: Error printing variable "c" Received on Wed Feb 20 2008 - 04:32:29 CST