The unsubscription is not successful.

Error message is :
:11:-2147352567:31:Method '~' of object '~' failed:0::0::11:-2147352567:31:Method '~' of object '~' failed:194:START: VBErrorInfo Description: Method '~' of object '~' failed HelpContext: 1000440 HelpFile: LastDllError: 0 Number: -2147352567 (0x80020009) Source: Agent_BUS END: VBErrorInfo :312:START: AppInfo ComputerName: PAZ02HTP3642 Operating System: Windows 2003 5.2.3790 (Service Pack 2) Time: Mon 2016:05:30 17:02:13 Title: Agent_BUS EXEName: Agent_BUS Path: D:\Components\TPO Components Version: 15.10.2 Unattended: True Retained: True StartMode: 1 Thread: 3140 END: AppInfo :337:START: ContextInfo IsInTransaction: True ContextInfo.ActivityId: {D8EBC529-0B7A-4C1E-83D4-2C4940DD7158} ContextInfo.ContextId: {C0D4C4D2-0BCC-403C-A8C8-A695E5F85B39} ContextInfo.IsInTransaction: True ContextInfo.TransactionId: {541DEB22-D2BB-4208-94AC-4CE1C6835AE6} IsSecurityEnabled: False ItemCount: 5 END: ContextInfo :38:START: ADODBErrors END: ADODBErrors :1:0:176:VB Error Source: Agent_BUS ** Computer: PAZ02HTP3642 App Path: D:\Components\TPO Components\Agent_BUS Filename: Contact_RW Function: UpdateContactEmailSubscriptionStatus: