java.util.ConcurrentModificationException
   at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
   at java.util.LinkedList$ListItr.next(LinkedList.java:696)
   at org.openide.util.EditableProperties.addItem(EditableProperties.java:390)
   at org.openide.util.EditableProperties.put(EditableProperties.java:250)
   at org.netbeans.core.startup.preferences.NbPreferences.putSpi(NbPreferences.java:123)
   at java.util.prefs.AbstractPreferences.put(AbstractPreferences.java:234)
   at org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:133)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogFactory.createUpdateProvider(AutoupdateCatalogFactory.java:124)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.netbeans.core.startup.layers.BinaryFS$AttrImpl$MethodAndParams.invoke(BinaryFS.java:604)
   at org.netbeans.core.startup.layers.BinaryFS$AttrImpl.getValue(BinaryFS.java:537)
   at org.netbeans.core.startup.layers.BinaryFS$BFSBase.getAttribute(BinaryFS.java:383)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:844)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:793)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:840)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:793)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:726)
   at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1370)
   at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:818)
   at org.openide.loaders.FolderLookup$ICItem.getInstance(FolderLookup.java:584)
   at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:999)
   at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
   at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:488)
   at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
   at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:488)
   at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl$LookupListenerImpl.allInstances(UpdateUnitProviderImpl.java:451)
   at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.getUpdateUnitProviders(UpdateUnitProviderImpl.java:254)
   at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.refreshProviders(UpdateUnitProviderImpl.java:300)
   at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl$LookupListenerImpl.resultChanged(UpdateUnitProviderImpl.java:444)
   at org.openide.util.lookup.AbstractLookup$NotifyListeners.run(AbstractLookup.java:521)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:641)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1123)