Persistent space question

I'm looking for help with an issue I don't understand.
I have a persistent space in a 'secure' environment that is set up using
httpmd for codebases, etc.
If I start the space and write entries to it, stop the space, recompile
my environment and restart the space,
I get a series of exceptions, basically:
-----------------------------------------------------------------------------------------------
java.rmi.UnmarshalException: Encountered a ClassNotFoundException while
unmarshalling com.cisco.si.entry.SiClassStructureEntry; nested exception is:
        java.lang.ClassNotFoundException: could not obtain preferred
value for: com.cisco.si.entry.SiClassStructureEntry
...
Caused by: java.lang.ClassNotFoundException: could not obtain preferred
value for: com.cisco.si.entry.SiClassStructureEntry
        at
net.jini.loader.pref.PreferredClassProvider.loadClass(PreferredClassProvider.java:363)
....
Caused by: net.jini.url.httpmd.WrongMessageDigestException: Incorrect
message digest for
httpmd://rtp-dnovice-vpn9.cisco.com:9080/TraceService-dl.jar;sha=9a013d3feb0f5ee8f63cb05b509b97b48ff33d10:
1be3682df18c02a6639d6d58ed3784709a247bf0
------------------------------------------------------------------------------------------------
Of course if I get rid of the persistent space by removing the datafile
and then restarting it, so it has no history, things work ok. However,
that's not an acceptable solution. How can I avoid this error?

Thanks,

-David

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