Problemas no Plano de Manutenção SQL Server 2005

Boa Tarde a todos!

Estou com problemas no Plano de Manutenção do SQL Server 2005. Agendei um Plano de Manutenção, mas ao olhar o histórico contém a seguinte mensagem de erro:

Mensagem

The job failed. The Job was invoked by Schedule 21 (Agendamento Plano de Manutenção). The last step to run was step 1 (Subplan).

Mensagem

Executed as user: Adm. Microsoft ® SQL Server Execute Package Utility Version 9.00.5000.00 for 32-bit Copyright © Microsoft Corp 1984-2005. All rights reserved. Started: 16:00:01 Warning: 2011-09-18 16:01:37.06 Code: 0x80012017 Source: Manutenção Banco X e Y Description: The package path referenced an object that cannot be found: "\Package\Subplan.Disable". This occurs when an attempt is made to resolve a package path to an object that cannot be found. End Warning DTExec: Could not set \Package\Subplan.Disable value to false. Started: 16:00:01 Finished: 16:01:37 Elapsed: 95.468 seconds. The package execution failed. The step failed.

Alguém pode me ajudar quanto a esta mensagem de erro?

Desde já obrigada.

Patrícia Nogueira.