Event ID 1000 in Windows 2003 Server SP2 Backup Failure while trying to schedule backup job

Hi,

After run below mentioned two commands, I am able to schedule on backup Job but when I am trying to add another backup job then the same error is coming. Plz. reply with the solutions.

Cacls.exe C:\Windows\Tasks /E /G "NT AUTHORITY\SYSTEM":F

Cacls.exe C:\Windows\Tasks /E /G BUILTIN\Administrators:F