[Zope] what does this warning message (Problem 100) mean after startup?

Hi, can someone explain me what the following startup warning means and what measures I must take to get rid of it? 2001-10-23T19:00:16 PROBLEM(100) ZODB FS FS21 warn: /Applications/Zope-2.4.0-MOSX/var/Data.fs time-stamp reduction at 2777802 Otherwise, Zope is running fine under OS X on a Powerbook G4 Thanks for any help --Sam