SQL & PL/SQL

Hi

   I saw a exmple in

edited: http://www.oraclefrontovik.com/2016/02/using-insert-all-with-related-tables/

but I tried to execute in my computer, and no work

CREATE TABLE parent_tbl (the_pk
NUMBER PRIMARY KEY,
object_id NUMBER);
  CREATE TABLE child_tbl (the_pk  
NUMBER PRIMARY KEY,
the_fk  
NUMBER,
object_name VARCHAR2(30));
ALTER TABLE child_tbl
    ADD CONSTRAINT child_tbl_fk1 FOREIGN KEY (the_fk)
    CREATE SEQUENCE parent_tbl_seq;
    CREATE SEQUENCE child_tbl_seq START WITH 500;                     
  
  
    INSERT ALL
    INTO parent_tbl(the_pk, object_id)
    VALUES (parent_tbl_seq.nextval,
object_id)
    INTO child_tbl(the_pk, the_fk, object_name)
    VALUES (child_tbl_seq.nextval,
parent_tbl_seq.currval,
object_name)
    SELECT uo.object_id,
uo.object_name
    FROM user_objects uo;

show me error:

ORA-02291: restrição de integridade myowner.CHILD_TBL_FK1) violada - chave mãe não localizada