ORA-01991: invalid password file ‘/oracle/app/product/9.2.0/dbs/orapwoat’

$ rm -f /oracle/app/product/9.2.0/dbs/orapwoat
$ orapwd file=/oracle/app/product/9.2.0/dbs/orapwoat password=oraclepass entries=10
$ sqlplus /nolog

SQL*Plus: Release 9.2.0.8.0 – Production on Mon Apr 11 09:16:33 2011

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

SQL>
SQL> conn / as sysdba
Connected.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open

SQL> alter database open noresetlogs;
alter database open noresetlogs
*
ERROR at line 1:
ORA-01588: must use RESETLOGS option for database open

SQL> alter database open resetlogs;

Database altered.

SQL>