Problems with Oracle Stored Procedures

[Michael]

Hello guys,
I have this stored procedure on an Oracle 10.1 database:

CREATE OR REPLACE PROCEDURE "SG"."REPGEN_EXP" (
p_recordset1 OUT SYS_REFCURSOR, codexp IN varchar2)
as
begin
OPEN p_recordset1 FOR
SELECT *
FROM EXP
where
COD_EXP = codexp;
end;

And it's working correctly
The problem is that I need to use another parameter (or variable, as you prefer), so after modifying the stored procedure, when I call it from my application (C# .Net 2005), I'm getting an error message (showed below)

NEW STORED PROCEDURE:

CREATE OR REPLACE PROCEDURE "SG"."REPGEN_EXP" (
p_recordset1 OUT SYS_REFCURSOR, codexp IN varchar2, model IN varchar2)
as
begin
OPEN p_recordset1 FOR
SELECT *
FROM EXP
where
COD_EXP = codexp
AND MOD = model;
end;

ERROR MESSAGE:

ORA-06550: line 1, column 7:
PLS-00306: PLS-00306: wrong number or types of arguments in call to 'REPGEN_EXP'

I only need to create a dataset from the resulting data of and Oracle Stored procedure, that's all I need.

Does anybody know why is this happening and how can I solve it ?

Thank you all

[Imran_Chennai]

How u r calling the procedure, initially u may called with 1 parameter, now u need to give 2, as two INs are there