getting error while executing drop package command in SQL

CREATE OR REPLACE PACKAGE employee2 AS
  PROCEDURE proce(f_name varchar2, l_name varchar2);
END;

CREATE OR REPLACE PACKAGE BODY employee2 AS
  PROCEDURE proce(f_name varchar2, l_name varchar2) IS
  BEGIN
   INSERT INTO emp2(f_name, l_name) VALUES(f_name, l_name);
  END;
END employee2;

BEGIN
  employee2.proce('bat', 'man');
END;

this code runs correctly and bat man get inserted to the table which i created.

but when it comes to dropping the package

DROP PACKAGE employee2;

it throws the following error;

SQL Error [933] [42000]: ORA-00933: SQL command not properly ended

help me out with this