计算机科学论坛--protege 中从XML项目转换为OWL项目时出现错误，请教如何解决

我通过protege构建了一个progete项目的本体，但是在我将其转换为OWL本体时出现如下错误，我使用的是
3。2beta，请问各位大侠这是什么原因造成的，请指教。
谢谢！！！
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\java.lang.ClassCastException: java.lang.String
at edu.stanford.smi.protegex.owl.model.triplestore.impl.AddRDFTypePropertyHandler.handleAdd(Unknown Source)
at edu.stanford.smi.protegex.owl.model.triplestore.impl.AbstractTripleStore.add(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser$MyStatementHandler.statement(Unknown Source)
at com.hp.hpl.jena.rdf.arp.ARPResource.tripleLit(ARPResource.java:191)
at com.hp.hpl.jena.rdf.arp.ARPResource.triple(ARPResource.java:173)
at com.hp.hpl.jena.rdf.arp.ARPResource.setPredObject(ARPResource.java:147)
at com.hp.hpl.jena.rdf.arp.ARPResource.setPredicateObject(ARPResource.java:128)

at com.hp.hpl.jena.rdf.arp.ParserSupport.createTriple(ParserSupport.java:331)
at com.hp.hpl.jena.rdf.arp.RDFParser.propertyEltIdAndValue(RDFParser.java:696)
at com.hp.hpl.jena.rdf.arp.RDFParser.propertyElt(RDFParser.java:651)
at com.hp.hpl.jena.rdf.arp.RDFParser.description(RDFParser.java:423)
at com.hp.hpl.jena.rdf.arp.RDFParser.obj(RDFParser.java:346)
at com.hp.hpl.jena.rdf.arp.RDFParser.rdf(RDFParser.java:326)
at com.hp.hpl.jena.rdf.arp.RDFParser.rdfFileSub(RDFParser.java:107)
at com.hp.hpl.jena.rdf.arp.RDFParser.rdfFile(RDFParser.java:99)
at com.hp.hpl.jena.rdf.arp.SingleThreadedParser.parse(SingleThreadedParser.java:146)

at com.hp.hpl.jena.rdf.arp.ARP.load(ARP.java:136)
at edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser$1.invokeARP(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.loadTriples(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.run(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.run(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.run(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.JenaOWLModel.load(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.JenaOWLModel.load(Unknown Source)
at edu.stanford.smi.protegex.owl.jena.JenaKnowledgeBaseFactory.loadKnowledgeBase(Unknown Source)
at edu.stanford.smi.protege.model.Project.loadDomainKB(Unknown Source)
at edu.stanford.smi.protege.model.Project.createDomainKnowledgeBase(Unknown Source)
at edu.stanford.smi.protege.model.Project.<init>(Unknown Source)
at edu.stanford.smi.protege.model.Project.<init>(Unknown Source)
at edu.stanford.smi.protege.model.Project.loadProjectFromURI(Unknown Source)
at edu.stanford.smi.protege.ui.ProjectManager.loadProjectFromURI(Unknown Source)
at edu.stanford.smi.protege.ui.ProjectManager.loadProject(Unknown Source)
at edu.stanford.smi.protege.ui.ProjectManager.changeProjectStorageFormatRequest(Unknown Source)
at edu.stanford.smi.protege.action.ChangeProjectStorageFormat.actionPerformed(Unknown Source)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Please consider running the file through an RDF or OWL validation service such as
- RDF Validator: http://www.w3.org/RDF/Validator
- OWL Validator: http://phoebus.cs.man.ac.uk:9999/OWL/Validator


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