Owl Ontology File Saving problems

[Suzie]

Hello,

I'm only new at this so please bear with me! I am creating an ontology
for a color game and i am using the pizza tutorial as a basis for it.
I did everything and when I went to save the file I get a message saying
save project errors with these error messages:

java.lang.RuntimeException: horrible http://www.owl-ontologies.com/unnamed.owl#0000
at
com.hp.hpl.jena.shared.impl.PrefixMappingImpl.checkProper
(PrefixMappingImpl.java:60)
com.hp.hpl.jena.shared.impl.PrefixMappingImpl.setNsPrefix
(PrefixMappingImpl.java:43)
com.hp.hpl.jena.graph.compose.PolyadicPrefixMappingImpl.setNsPrefix
(PolyadicPrefixMappingImpl.java:35)
com.hp.hpl.jena.rdf.model.impl.ModelCom.setNsPrefix(ModelCom.java:856)
edu.stanford.smi.protegex.owl.jena.creator.JenaCreator.createPrefixes
(JenaCreator.java:565)
edu.stanford.smi.protegex.owl.jena.creator.JenaCreator.run
JenaCreator.java:761)
edu.stanford.smi.protegex.owl.jena.creator.JenaCreator.createOntModel
(JenaCreator.java:456)
atedu.stanford.smi.protegex.owl.jena.JenaOWLKnowledgeBase.getOntModel
(JenaOWLKnowledgeBase.java:449)
edu.stanford.smi.protegex.owl.jena.JenaOWLKnowledgeBase.save
(JenaOWLKnowledgeBase.java:1026)
atedu.stanford.smi.protegex.owl.jena.JenaKnowledgeBaseFactory.
saveKnowledgeBase(JenaKnowledgeBaseFactory.java:152)
edu.stanford.smi.protege.model.Project.saveDomainKB(Unknown Source)
edu.stanford.smi.protege.model.Project.save(Unknown Source)
edu.stanford.smi.protege.ui.ProjectManager.save(Unknown Source)
edu.stanford.smi.protege.ui.ProjectManager.saveProjectRequest
(Unknown Source)
edu.stanford.smi.protege.action.SaveProject.actionPerformed(Unknown Source)
javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
javax.swing.AbstractButton$ForwardActionEvents.actionPerformed
(Unknown Source)
javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
javax.swing.DefaultButtonModel.setPressed(Unknown Source)
javax.swing.AbstractButton.doClick(Unknown Source)
javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased
(Unknown
Source)
java.awt.Component.processMouseEvent(Unknown Source)
java.awt.Component.processEvent(Unknown Source)
java.awt.Container.processEvent(Unknown Source)
java.awt.Component.dispatchEventImpl(Unknown Source)
java.awt.Container.dispatchEventImpl(Unknown Source)
java.awt.Component.dispatchEvent(Unknown Source)
java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
java.awt.Container.dispatchEventImpl(Unknown Source)
java.awt.Window.dispatchEventImpl(Unknown Source)
java.awt.Component.dispatchEvent(Unknown Source)
java.awt.EventQueue.dispatchEvent(Unknown Source)
java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
java.awt.EventDispatchThread.run(Unknown Source)


I have no idea what could be wrong?? I have a class called html code and i have
sublasses that have actual html codes-would it be anything to do with the fact
that I have numbers as names for the classes? This is for a final year project
and it won't let me save my work so i've had to re-do it five times already!!
Any help would be greatly appreciated!