ORA-00704 bootstrap process failure

while i create fresh database using 10.2.0. i faced bootstrap failure. i was scared. most of them asked me to contact oracle. but again i tried with upgrade option and run catalog.sql and catproc.sql script, the problem was solved, now the db is working fine. But still i am not able to find the root cause why it was happen. If any one know please share the details..

ORA-00704: bootstrap process failure
ORA-39700: database must be opened with upgrade option

platform : Redhat 4