ORA-06511 in recursive routine

Hi,

I am opening a cursor in a recursive function:

-------------------------------------------

CREATE OR REPLACE PACKAGE TEST
    AUTHID CURRENT_USER
AS
    FUNCTION  Recursive_Func (param VARCHAR2)
        RETURN VARCHAR2;
END TEST;
/

CREATE OR REPLACE PACKAGE BODY TEST AS

    CURSOR c_Test
    IS
        SELECT DISTINCT
               ...
          FROM
               ...
         WHERE
               ...;

    FUNCTION  Recursive_Func (p_param VARCHAR2)
        RETURN VARCHAR2
    IS
        Value VARCHAR2(500);
    BEGIN
        FOR r_Test IN c_Test
        LOOP
            IF condition THEN
                Value := Other_NonRec_Func
                            (Value,
                             Recursive_Func(r_Test.column));
            END IF;
        END LOOP;

        RETURN Value;
    END Recursive_Func;
END TEST;
/
-------------------------------------------

The result is

The result is

ORA-06511: PL/SQL: cursor already open