Archive task fails - EventID: 2256

Hello all,

We have EV 10.0.1 installed in test environment, running on Windows 2008 R2.
Today, I noticed "Exchange Mailbox Archiving Task" was in "Failed" status with below information in event viewer:

----------------------
The Archiving Task 'Exchange Mailbox Archiving Task for TSTEXCH' could not be started due to startup errors.
For more information, see Help and Support Center at http://evevent.symantec.com/rosetta/showevent.asp?EvtID=2256

Log Name:      Symantec Enterprise Vault
Source:        Enterprise Vault
Date:          7/2/2012 10:24:37 AM
Event ID:      2256
Task Category: Archive Task
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      <test EV server>
Description:
The Archiving Task 'Exchange Mailbox Archiving Task for TSTEXCH' could not be started due to startup errors.

For more information, see Help and Support Center at http://evevent.symantec.com/rosetta/showevent.asp?EvtID=2256
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Enterprise Vault " />
    <EventID Qualifiers="49156">2256</EventID>
    <Level>2</Level>
    <Task>19</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2012-07-02T15:24:37.000000000Z" />
    <EventRecordID>582</EventRecordID>
    <Channel>Symantec Enterprise Vault</Channel>
    <Computer>testEVserver</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Exchange Mailbox Archiving Task for TSTEXCH</Data>
  </EventData>
</Event>
----------------------

I am trying to figure out what is causing this and how to resolve it. Is there a way I can see more detailed log of what the problem is?
I right clicked on Task, click Properties and checked "Run in Report mode" and then tried to start, but when looked under Reports directory it did not create anything.

Looed at the link mentioned in event viewer, but not seeing anything that is helpful in my case.

Yes, this is test EV server connected to test AD domain and test exchange, but I am new to EV and trying to understand this world...

Thanks,