I am running the latest Enterprise Vault (Version: 9.0.1.1073) and the latest OWA 2010 Extensions on the CAS servers.

On both my Exchange 2010 SP1 CAS Servers, I receive the following error in the event viewer:

Log Name:      Application
Source:        Enterprise Vault OWA Extensions
Date:          12/9/2010 9:47:55 AM
Event ID:      0
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      CAS110.FLAS.CSI.CUNY.EDU
Description:
An unhandled exception was caught:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Symantec.EnterpriseVault.Owa.ResponseFilters.Premium.Folder.ProcessSP1()
   at Symantec.EnterpriseVault.Owa.ResponseFilters.ResponseFilterBase.Close()
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Enterprise Vault OWA Extensions" />
    <EventID Qualifiers="0">0</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-12-09T14:47:55.000000000Z" />
    <EventRecordID>13840</EventRecordID>
    <Channel>Application</Channel>
    <Computer>CAS110.FLAS.CSI.CUNY.EDU</Computer>
    <Security />
  </System>
  <EventData>
    <Data>An unhandled exception was caught:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Symantec.EnterpriseVault.Owa.ResponseFilters.Premium.Folder.ProcessSP1()
   at Symantec.EnterpriseVault.Owa.ResponseFilters.ResponseFilterBase.Close()</Data>
  </EventData>
</Event>

Any idea on what can be causing this?