[exec] java.util.ConcurrentModificationException
     [exec]     at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
     [exec]     at java.util.LinkedList$ListItr.add(LinkedList.java:752)
     [exec]     at org.openide.util.EditableProperties.addItem(EditableProperties.java:393)
     [exec]     at org.openide.util.EditableProperties.put(EditableProperties.java:250)
     [exec]     at org.openide.util.EditableProperties.put(EditableProperties.java:84)
     [exec]     at java.util.AbstractMap.putAll(AbstractMap.java:256)
     [exec]     at org.netbeans.core.startup.preferences.NbPreferences.properties(NbPreferences.java:189)
     [exec]     at org.netbeans.core.startup.preferences.NbPreferences.getSpi(NbPreferences.java:110)
     [exec]     at org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:130)
     [exec]     at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogFactory.createUpdateProvider(AutoupdateCatalogFactory.java:128)
     [exec] Caused: java.lang.reflect.InvocationTargetException
     [exec]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [exec]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     [exec]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [exec]     at java.lang.reflect.Method.invoke(Method.java:597)
     [exec]     at org.netbeans.core.startup.layers.BinaryFS$AttrImpl$MethodAndParams.invoke(BinaryFS.java:604)
     [exec]     at org.netbeans.core.startup.layers.BinaryFS$AttrImpl.getValue(BinaryFS.java:537)
     [exec]     at org.netbeans.core.startup.layers.BinaryFS$BFSBase.getAttribute(BinaryFS.java:383)
     [exec]     at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:844)
     [exec]     at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:793)
     [exec]     at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:840)
     [exec]     at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:793)
     [exec]     at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:726)
     [exec]     at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1370)
     [exec]     at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:818)
     [exec]     at org.openide.loaders.FolderLookup$ICItem.getInstance(FolderLookup.java:584)
     [exec]     at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:999)
     [exec]     at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
     [exec]     at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:488)
     [exec]     at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
     [exec]     at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:488)
     [exec]     at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl$LookupListenerImpl.allInstances(UpdateUnitProviderImpl.java:451)
     [exec]     at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.getUpdateUnitProviders(UpdateUnitProviderImpl.java:254)
     [exec]     at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.refreshProviders(UpdateUnitProviderImpl.java:300)
     [exec]     at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl$LookupListenerImpl.resultChanged(UpdateUnitProviderImpl.java:444)
     [exec] [catch] at org.openide.util.lookup.AbstractLookup$NotifyListeners.run(AbstractLookup.java:521)
     [exec]     at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:641)
     [exec]     at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1123)