java.lang.IllegalArgumentException: Already listening to /home/erno/NetBeansProjects/RailsApplication5/app/controllers
        at org.netbeans.modules.ruby.modules.project.rake.FileChangeSupport.addListener(FileChangeSupport.java:92)
        at org.netbeans.modules.ruby.spi.project.support.rake.SourcesHelper$SourcesImpl.listen(SourcesHelper.java:475)
        at org.netbeans.modules.ruby.spi.project.support.rake.SourcesHelper$SourcesImpl.getSourceGroups(SourcesHelper.java:409)
        at org.netbeans.modules.ruby.railsprojects.RailsSources$2.run(RailsSources.java:114)
        at org.netbeans.modules.ruby.railsprojects.RailsSources$2.run(RailsSources.java:105)
        at org.openide.util.Mutex.readAccess(Mutex.java:327)
        at org.openide.util.Mutex$1R.run(Mutex.java:1299)
        at org.netbeans.api.project.ProjectManager$2$1.run(ProjectManager.java:120)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499)
        at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:216)
        at org.netbeans.api.project.ProjectManager$2.execute(ProjectManager.java:118)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1320)
        at org.openide.util.Mutex.readAccess(Mutex.java:275)
        at org.netbeans.modules.ruby.railsprojects.RailsSources.getSourceGroups(RailsSources.java:104)
        at org.netbeans.spi.project.support.LookupProviderSupport$SourcesImpl.getSourceGroups(LookupProviderSupport.java:259)
        at org.netbeans.modules.ruby.railsprojects.ui.RailsLogicalViewProvider$RailsLogicalViewRootNode.setProjectFiles(RailsLogicalViewProvider.java:262)
        at org.netbeans.modules.ruby.railsprojects.ui.RailsLogicalViewProvider$RailsLogicalViewRootNode.<init>(RailsLogicalViewProvider.java:234)
        at org.netbeans.modules.ruby.railsprojects.ui.RailsLogicalViewProvider.createLogicalView(RailsLogicalViewProvider.java:134)
        at org.netbeans.modules.project.ui.ProjectsRootNode$ProjectChildren.logicalViewForProject(ProjectsRootNode.java:300)
        at org.netbeans.modules.project.ui.ProjectsRootNode$ProjectChildren.createNodes(ProjectsRootNode.java:261)
        at org.netbeans.modules.project.ui.ProjectsRootNode$ProjectChildren.createNodes(ProjectsRootNode.java:219)
        at org.openide.nodes.Children$Keys$KE.nodes(Children.java:1572)
        at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:168)
        at org.openide.nodes.EntrySupport$Default$Info.nodes(EntrySupport.java:926)
        at org.openide.nodes.EntrySupport$Default.updateAdd(EntrySupport.java:506)
        at org.openide.nodes.EntrySupport$Default.setEntries(EntrySupport.java:339)
        at org.openide.nodes.Children$Keys$2.run(Children.java:1466)
        at org.openide.util.Mutex.postRequest(Mutex.java:1251)
        at org.openide.util.Mutex.postWriteRequest(Mutex.java:582)
        at org.openide.nodes.Children$Keys.applyKeys(Children.java:1475)
        at org.openide.nodes.Children$Keys.setKeys(Children.java:1419)
        at org.netbeans.modules.project.ui.ProjectsRootNode$ProjectChildren.propertyChange(ProjectsRootNode.java:318)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270)
        at org.netbeans.modules.project.ui.OpenProjectList$4.run(OpenProjectList.java:637)
        at org.netbeans.modules.project.ui.OpenProjectList$4.run(OpenProjectList.java:636)
        at org.openide.util.Mutex$1AWTWorker.run(Mutex.java:1370)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:535)
        at java.awt.Dialog$2.run(Dialog.java:565)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.awt.Dialog.show(Dialog.java:563)
        at java.awt.Component.show(Component.java:1302)
        at java.awt.Component.setVisible(Component.java:1255)
        at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:516)
        at org.netbeans.modules.project.ui.actions.NewProject$2.run(NewProject.java:214)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)