[ND] ArrayStoreException ... need help urgently!!!

[Lionel]

I'm in the process of migrating
a project from ver 3.13 to version 4.1.3.8 of Netdynamics. 
I get this error below. 


CSpFileBased:c:934298785755:w:934323272673:deserializeObject: Unexpected Exception 
(java.lang.ArrayStoreException) caught. Top of stack: |java.lang.ArrayStoreException
        at java.io.ObjectInputStream.inputArray(Compiled Code)
        at java.io.ObjectInputStream.readObject(Compiled Code)
        at java.io.ObjectInputStream.defaultReadObject(Compiled Code)
        at java.io.ObjectInputStream.inputObject(Compiled Code)
        at java.io.ObjectInputStream.readObject(Compiled Code)
        at java.io.ObjectInputStream.readObject(Compiled Code)
        at spider.CSpFileBased.deserializeObject(Compiled Code)
        at spider.CSpProject.deserializeAndInitAnObject(Compiled Code)
        at spider.CSpProject.getCommonPage(Compiled Code)
        at spider.CSpider.getCommonPage(Compiled Code)
        at spider.CSpider.getPage(Compiled Code)
        at spider.CSpider.getPage(Compiled Code)
        at pps_tdhr.pgIPPSSupMenu.onHrefWebEvent(pgIPPSSupMenu.java:218)
        at spider.util.CSpMethod.call(Compiled Code)
        at spider.control.CSpWebEventProcessor.callThisMethod(Compiled Code)
        at spider.control.CSpWebEventProcessor.run(Compiled Code)
        at netdyn.services.cp.worker.CNdCPWorkerImpl.webEventMessage(Compiled Code)
        at netdyn.services.cp.stubs._tie_INdCPWorker.webEventMessage(Compiled Code)
        at netdyn.services.cp.stubs._INdCPWorkerImplBase._execute(Compiled Code)
        at netdyn.services.cp.stubs._INdCPWorkerImplBase._execute(Compiled Code)
        at com.visigenic.vbroker.orb.SkeletonDelegateImpl.execute(Compiled Code)
        at com.visigenic.vbroker.orb.GiopProtocolAdapter.doRequest(Compiled Code)
        at com.visigenic.vbroker.orb.GiopProtocolAdapter.dispatchMessage(Compiled Code)
        at com.visigenic.vbroker.orb.ThreadPoolDispatcher.run(Compiled Code)
        at com.visigenic.vbroker.orb.WorkerThread.run(Compiled Code)

Any suggestions would be of great help to me.
Thanks,
Lionel.
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