can not generate one storage report

Hi all,

Windows 2003 R2 and file server resource manager

I tried to generate the report on files that have not been accessed for 580 days on one drive.

It failed with this error:

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Event Type: Error
Event Source: SRMREPORTS
Event Category: None
Event ID: 602
Date:  6/14/2013
Time:  7:11:10 PM
User:  N/A
Computer: fileserver
Description:
Error generating report with the name 'LeastRecentlyAccessed16' and task name 'FSRM_Report_Task{b2fc1c9c-6a8f-4b8a-9683-dcda48d12683}'.

Context:
 - Exception encountered = Not a valid Win32 FileTime.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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Ho do I fix this error and get the report?

Thank you.