Hi,
I have this problem:
ORA-19802: cannot use DB_RECOVERY_FILE_DEST without DB_RECOVERY_FILE_DEST_SIZE

oracle version is 10g on Linux.
The db had worked fine until I restarted it .

some one could help me?

One of the site give the probable cause & action you should do:

Cause: There are two possible cause for this error:
1) The DB_RECOVERY_FILE_DEST parameter was in use when no DB_RECOVERY_FILE_DEST_SIZE parameter was encountered while fetching initialization parameter.
2) An attempt was made to set DB_RECOVERY_FILE_DEST with the ALTER SYSTEM command when no DB_RECOVERY_FILE_DEST_SIZE was in use.

Action: Correct the dependency parameter definitions and retry the command.
------------------------------------------
Please see your INIT.ORA or SPFILE to set the proper parameters.

I did it but nothing is changed

that is my init.ora:
audit_file_dest = /u03/app/oracle/admin/orcl/adump
background_dump_dest = /u03/app/oracle/admin/orcl/bdump
core_dump_dest = /u03/app/oracle/admin/orcl/cdump
db_file_multiblock_read_count = 16
dispatchers = '(PROTOCOL=TCP) (SERVICE=orclXDB)'
job_queue_processes = 10
user_dump_dest = /u03/app/oracle/admin/orcl/udump
compatible = 10.2.0.1.0
control_files = ('/u03/app/oracle/oradata/orcl/control01.ctl', '/u03/app/oracle/oradata/orcl/control02.ctl', '/u03/app/oracle/oradata/orcl/control03.ctl')
db_block_size = 8192
db_domain = ''
db_name = orcl
db_recovery_file_dest = /u03/app/oracle/flash_recovery_area
db_recovery_file_dest_size = 2G
open_cursors = 300
pga_aggregate_target = 90M
processes = 150
remote_login_passwordfile = EXCLUSIVE
sga_target = 427819008
undo_management = AUTO
undo_tablespace = UNDOTBS1

do you see something wrong?

When did you receive this error? If it was at database startup then check whether you are using spfile or pfile.

I am using spfile