[Zope] FileStorageFormatError

[a32955@pop-server.nc.rr.com]

I performed a normal shutdown of my Linux box (for reasons unrelated to 
Zope).  When I rebooted the server, Zope could not start.  The traceback is 
below.  I can find no documentation of this error.  Any ideas of what I can 
do?  Or why this happened?  Zope appeared to be running normally before I 
shutdown the server.

Traceback (most recent call last):
   File "/usr/src/Zope-2.3.0-src/z2.py", line 565, in ?
     exec "import "+MODULE in {}
   File "<string>", line 1, in ?
   File "/usr/src/Zope-2.3.0-src/lib/python/Zope/__init__.py", line 110, in ?
     DB=ZODB.FileStorage.FileStorage(Globals.BobobaseName)
   File "/usr/src/Zope-2.3.0-src/lib/python/ZODB/FileStorage.py", line 306, 
in __init__
     read_only=read_only,
   File "/usr/src/Zope-2.3.0-src/lib/python/ZODB/FileStorage.py", line 
1551, in read_index
     if read(4) != packed_version: raise FileStorageFormatError, name
ZODB.FileStorage.FileStorageFormatError: /usr/src/Zope-2.3.0-src/var/Data.fs