Why do I get this ORA-21780 error?

Question

So I have a before insert update trigger and all it does it simply populate some audit columns in my record.
Why when I move data into this table would I get this error?
At no time is this trigger also inserting into the same table.
ORA-21780: Maximum number of object durations exceeded.
ORA-06512: at "SYS.STANDARD", line 575
ORA-06512: at "BEFORE_INSERT_UPDATE_TRG", line 4
ORA-04088: error during execution of trigger 'BEFORE_INSERT_UPDATE_TRG'
This is with an Oracle 11gR1 RAC setup.

Answer 1

it works OK for me.
SQL> drop table table1;
Table dropped.
SQL> @trig1
SQL> create table table1
  2  (id number,
  3  field_a varchar2(30),
  4  field_b timestamp,
  5  field_c varchar2(30),
  6  field_d timestamp)
  7  /
Table created.
SQL> CREATE OR REPLACE TRIGGER "BEFORE_INSERT_UPDATE_TRG'"
  2        BEFORE INSERT OR UPDATE
  3        ON TABLE1
  4        FOR EACH ROW
  5        BEGIN
  6            IF inserting then
  7                 :new.field_a    := nvl(:new.field_a,user);
  8                 :new.field_b  := nvl(:new.field_b,systimestamp);
  9            ELSIF updating then
10                 :new.field_c   := nvl(:new.field_c,user);
11                 :new.field_d := systimestamp;
12            END IF;
13        END;
14  /
Trigger created.
SQL> insert into table1 (id) values(1);
1 row created.
SQL> select * from table1;
     ID FIELD_A
FIELD_B
FIELD_C
FIELD_D
      1 USER1
16-APR-11 07.53.50.581147 PM
SQL>