Client Tools :: SQLPLUS - How To Execute Store Proc When Passing Only 2 Out Of 3 Parameters

I am trying to execute a STORE PROCEDURE from SQL*PLUS with no success:

SQL> execute PACKAGE.PROC(201011,'144792');
BEGIN PACKAGE.PROC(201011,'144792'); END;

*
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to
'PROC'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

In fact, when i do: desc PACKAGENAME . I see that the procedure is waiting for 3 parameters and one of them is a REF CURSOR type:

SQL> desc PACKAGENAME
PROCEDURE PROCEDURENAME

Argument Name Type In/Out Default?
------------------------------ ----------------------- ------ --------
PWEEK NUMBER IN
PCLIENT VARCHAR2 IN
CRESULTS REF CURSOR IN/OUT

After searching a bit, i try the following:

SQL> execute PACKAGE.NAME(201011,'144792','CRESULTS
'=>:C1);
SP2-0552: Bind variable "C1" not declared.
SQL>

This is a preview of the PACKAGE header:

CREATE OR REPLACE PACKAGE PACKAGENAME
AUTHID CURRENT_USER
AS
--

TYPE CurTyp_Supp IS REF CURSOR;

--
TYPE TabTyp_Supp IS TABLE OF VARCHAR2 (10 BYTE);

--
TYPE ObjTyp_Prmt IS OBJECT (p_schemaname VARCHAR, p_filename VARCHAR);

--
PROCEDURE PROC(pWEEK NUMBER,
pCLIENT VARCHAR,
cResults IN OUT CurTyp_Supp);

This what the PACKAGE BODY looks like:

CREATE OR REPLACE PACKAGE BODY PACKAGENAME
IS
PROCEDURE PROC (pWEEK NUMBER,
pCLIENT VARCHAR,
cResults IN OUT CurTyp_Supp)

QUESTION:
HOW DO I MANAGE TO EXECUTE THIS PROCEDURE FROM SQL*PLUS