SQL Server Maintenance Plan Issue

SQL Server Version:

Microsoft SQL Server 2005 - 9.00.5000.00 (Intel X86) Dec 10 2010 10:56:29 Copyright (c) 1988-2005 Microsoft Corporation Enterprise Edition on Windows NT 5.2 (Build 3790: Service Pack 2)

Issue : Maintenance Plan - DB backup plan & TRN Log backup plan skipped / some times not deleting the old backup files.

Error : Failed to retrieve date for this request (Microsoft.SqlServer.SmoEnum)

Additional Informaiton

An exception occurred while executing a Transact-SQL statement or batch.

(Microsoft.SqlServer.ConnectionInfo)

A Server error occurred on the current command.

The results, if any should be discarded (Microsoft Sql Server)

Any experts can help me to resolve this issue.

Thanks

drmrpush

MRVSFLY