SQL Maintence Plans Not Running

Hi There,

I've got an SQL maintence plan that runs a database backup job and a database integrity check. These jobs have both started to fail and i can't figure out why. When i go into job history and have detailed history i find both jobs with this error message.
 
Executed as user: MIRAMAR\sqlserver. sqlmaint.exe failed. [SQLSTATE 42000] (Error 22029).  The step failed.


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When i look in the event logs i recieve this warning for the failed backup job


Event Type:      Warning
Event Source:      SQLAgent$CARESYS
Event Category:      Job Engine
Event ID:      208
Date:            09/11/2006
Time:            11:02:52
User:            N/A
Computer:      DC03
Description:
SQL Server Scheduled Job 'DB Backup Job for DB Maintenance Plan 'CareSys Databases'' (0x94A0D57F156CBF44AA2AAD4CFABBF6C5) - Status: Failed - Invoked on: 2006-11-09 11:02:52 - Message: The job failed.  The Job was invoked by User MIRAMAR\administrator.  The last step to run was step 1 (Step 1).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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And this warning for the failed integrity job

Event Type:      Warning
Event Source:      SQLAgent$CARESYS
Event Category:      Job Engine
Event ID:      208
Date:            09/11/2006
Time:            12:09:29
User:            N/A
Computer:      DC03
Description:
SQL Server Scheduled Job 'Integrity Checks Job for DB Maintenance Plan 'CareSys Databases'' (0x7F6E3ECE3941E24EA29D0A4E0CB0E9DB) - Status: Failed - Invoked on: 2006-11-09 12:09:29 - Message: The job failed.  The Job was invoked by User MIRAMAR\administrator.  The last step to run was step 1 (Step 1).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.


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Please help me as it is driving me up the wall