[ZODB-Dev] What does this POSKeyError mean?

[Chris Withers]

2003-10-04T02:26:15 INFO(0) zrpc-conn:212.49.213.7:34807 modifiedInVersion() 
raised exception: 00000000000047dc
Traceback (innermost last):
   File /usr/local/zope/2.6.2/lib/python/ZEO/zrpc/connection.py, line 234, in 
handle_request
   File /usr/local/zope/2.6.2/lib/python/ZODB/FileStorage.py, line 689, in 
modifiedInVersion
     (Object: /home/zope/x.fs)
POSKeyError: 00000000000047dc

cheers,

Chris