Error in Analysis for Office 1.4.11

Hi ,

Presently we are using AO for adhoc reporting in one of our projects and all the dates are displayed as expected .For one of the Dates we are getting a typical error message .

General .NET Exception:
date -62135616600000 <  minimum value -62135596800000@bali.util.Date.Date(long date).could any one help me undertand what would have been the reason for this error message ?

Thanks in advance !