Problems Backing Up SQL DB.

Every time i try to back up a specific DB i get an error saying it can
not backup because the full text catalog is not permitted because it
is not online. It does not matter if i try to backup the db through
SQL of my Backup software. here is the sql log.

LogJob History (DB File level Backup.Subplan_1)

Step ID1
ServerServer Name
Job NameDB File level Backup.Subplan_1
Step NameSubplan_1
Duration00:00:01
Sql Severity0
Sql Message ID0
Operator Emailed
Operator Net sent
Operator Paged
Retries Attempted0

Message
Executed as user: DomainUSer. ...ecute Package Utility Version
9.00.3042.00 for 32-bit Copyright (C) Microsoft Corp 1984-2005. All
rights reserved. Started: 7:07:43 AM Progress: 2007-06-01
07:07:44.14 Source: {B6285A6A-0066-416F-AD9F-F31ED5A68F14}
Executing query "DECLARE @Guid UNIQUEIDENTIFIER EXECUTE
msdb..sp".: 100% complete End Progress Error: 2007-06-01
07:07:44.49 Code: 0xC002F210 Source: Back Up Database (Full)
Execute SQL Task Description: Executing the query "BACKUP DATABASE
[DBName] FILEGROUP = N'PRIMARY' TO DISK = N'E:Program Files
Microsoft SQL ServerMSSQL.1MSSQLBackupDBName_200706010707.ba k'
WITH NOFORMAT, NOINIT, NAME = N'DBName_backup_20070601070744', SKIP,
REWIND, NOUNLOAD, STATS = 10 " failed with the following error: "The
backup of full-text catalog 'ftcat_documentindex' is not permitted
because it is not online. Check errorlog file for the reason that full-
text catalog became offline and . The step failed.