CREATE OR REPLACE PACKAGE TEST123 AS

    PROCEDURE TEST1(xcursor OUT SYS_REFCURSOR, xstring OUT VARCHAR2);
        
END TEST123;
/

CREATE OR REPLACE PACKAGE BODY TEST123 AS
    
    PROCEDURE TEST1(xcursor OUT SYS_REFCURSOR, xstring OUT VARCHAR2)
    
    AS BEGIN
        open xcursor for SELECT 'one banana' as abc from dual; 
        xstring := 'yellow';       
    END TEST1;
         
END TEST123;
/

ORA-06550: line 1, column 29:
PLS-00103: Encountered the symbol ";" when expecting one of the following:

   . ( ) , * @ % & | = - + < / > at in is mod remainder not
   range rem => .. <an exponent (**)> <> or != or ~= >= <= <>
   and or like LIKE2_ LIKE4_ LIKEC_ as between from using ||
   indicator multiset member SUBMULTISET_

The symbol ", was inserted before ";" to continue.

SQL> CREATE OR REPLACE PACKAGE Test123 AS
  2
  3      PROCEDURE TEST1(xcursor OUT SYS_REFCURSOR, xstring OUT VARCHAR2);
  4
  5  END Test123;
  6  /

Package created.

SQL>
SQL> CREATE OR REPLACE PACKAGE BODY Test123 AS
  2
  3      PROCEDURE TEST1(xcursor OUT SYS_REFCURSOR, xstring OUT VARCHAR2)
  4
  5      AS BEGIN
  6          OPEN xcursor FOR SELECT 'one banana' AS Abc FROM dual;
  7          xstring := 'yellow';
  8      END TEST1;
  9
 10  END Test123;
 11  /

Package body created.

SQL> select * From v$version;

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

SQL>