java.lang.IllegalArgumentException: Already listening to /Users/tor/designer/clone/Tool/test
        at org.openide.filesystems.FileUtil.addFileChangeListener(FileUtil.java:242)
        at org.netbeans.modules.java.api.common.SourceRoots$ProjectMetadataListener.add(SourceRoots.java:511)
        at org.netbeans.modules.java.api.common.SourceRoots$4.run(SourceRoots.java:257)
        at org.netbeans.modules.java.api.common.SourceRoots$4.run(SourceRoots.java:235)
        at org.openide.util.Mutex.readAccess(Mutex.java:285)
        at org.netbeans.modules.java.api.common.SourceRoots.getRootURLs(SourceRoots.java:235)
        at org.netbeans.modules.java.api.common.SourceRoots$3.run(SourceRoots.java:210)
        at org.netbeans.modules.java.api.common.SourceRoots$3.run(SourceRoots.java:205)
        at org.openide.util.Mutex.readAccess(Mutex.java:285)
        at org.netbeans.modules.java.api.common.SourceRoots.getRoots(SourceRoots.java:205)
        at org.netbeans.modules.java.api.common.classpath.ClassPathProviderImpl.getTestSrcDir(ClassPathProviderImpl.java:142)
        at org.netbeans.modules.java.api.common.classpath.ClassPathProviderImpl.getType(ClassPathProviderImpl.java:181)
        at org.netbeans.modules.java.api.common.classpath.ClassPathProviderImpl.getSourcepath(ClassPathProviderImpl.java:277)
        at org.netbeans.modules.java.api.common.classpath.ClassPathProviderImpl.findClassPath(ClassPathProviderImpl.java:315)
        at org.netbeans.spi.java.project.support.ClassPathProviderMerger$ProxyClassPathImplementation.checkProviders(ClassPathProviderMerger.java:165)
        at org.netbeans.spi.java.project.support.ClassPathProviderMerger$ProxyClassPathImplementation.<init>(ClassPathProviderMerger.java:148)
        at org.netbeans.spi.java.project.support.ClassPathProviderMerger$CPProvider.findClassPath(ClassPathProviderMerger.java:105)
        at org.netbeans.modules.java.project.ProjectClassPathProvider.findClassPath(ProjectClassPathProvider.java:65)
        at org.netbeans.api.java.classpath.ClassPath.getClassPath(ClassPath.java:550)
        at org.netbeans.modules.java.source.usages.BuildArtifactMapperImpl$FileBuildQueryImpl.getStatus(BuildArtifactMapperImpl.java:547)
        at org.netbeans.api.queries.FileBuiltQuery.getStatus(FileBuiltQuery.java:99)
        at org.netbeans.modules.java.JavaNode$BuildStatusTask.run(JavaNode.java:326)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:577)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1030)
Caused: org.openide.util.RequestProcessor$Item: task failed due to: java.lang.IllegalArgumentException: Already listening to /Users/tor/designer/clone/Tool/test
        at org.openide.util.RequestProcessor.post(RequestProcessor.java:267)
        at org.netbeans.modules.java.JavaNode.<init>(JavaNode.java:123)
        at org.netbeans.api.java.loaders.JavaDataSupport.createJavaNode(JavaDataSupport.java:88)
        at org.netbeans.modules.java.JavaDataObject.createNodeDelegate(JavaDataObject.java:100)
        at org.openide.loaders.DataObject$1.run(DataObject.java:285)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.util.Mutex$1R.run(Mutex.java:1301)
        at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1810)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1320)
        at org.openide.util.Mutex.readAccess(Mutex.java:351)
        at org.openide.loaders.DataObject.getNodeDelegateImpl(DataObject.java:281)
        at org.openide.loaders.DataObject.getNodeDelegate(DataObject.java:273)
        at org.openide.text.DataEditorSupport.messageHtmlName(DataEditorSupport.java:209)
        at org.openide.text.CloneableEditor$2.run(CloneableEditor.java:832)
        at org.openide.util.Mutex.doEvent(Mutex.java:1335)
        at org.openide.util.Mutex.writeAccess(Mutex.java:452)
        at org.openide.text.CloneableEditor.updateName(CloneableEditor.java:829)
        at org.openide.text.CloneableEditor.readExternal(CloneableEditor.java:935)
        at org.openide.windows.TopComponent$Replacer.readObject(TopComponent.java:1523)
        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 java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SettingsRecognizer.readSerial(XMLSettingsSupport.java:544)
        at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SettingsRecognizer.instanceCreate(XMLSettingsSupport.java:576)
        at org.netbeans.modules.settings.convertors.SerialDataConvertor$SettingsInstance.instanceCreate(SerialDataConvertor.java:420)
        at org.netbeans.core.windows.persistence.PersistenceManager.getTopComponentPersistentForID(PersistenceManager.java:530)
        at org.netbeans.core.windows.persistence.PersistenceManager.getTopComponentForID(PersistenceManager.java:640)
        at org.netbeans.core.windows.PersistenceHandler.getTopComponentForID(PersistenceHandler.java:457)
        at org.netbeans.core.windows.PersistenceHandler.load(PersistenceHandler.java:145)
        at org.netbeans.core.windows.WindowSystemImpl.load(WindowSystemImpl.java:77)
        at org.netbeans.core.NonGui$2.run(NonGui.java:184)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:633)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)