java.lang.IllegalArgumentException: Already listening to /home/tomas/NetBeansProjects/RailsApplication126/${test/unit}
        at org.netbeans.modules.ruby.modules.project.rake.FileChangeSupport.addListener(FileChangeSupport.java:93)
        at org.netbeans.modules.ruby.spi.project.support.rake.SourcesHelper$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$2.run(RailsSources.java:105)
        at org.openide.util.Mutex.readAccess(Mutex.java:252)
        at org.netbeans.modules.ruby.railsprojects.RailsSources.getSourceGroups(RailsSources.java:104)
        at org.netbeans.spi.project.support.LookupProviderSupport$SourcesImpl.getSourceGroups(LookupProviderSupport.java:259)
        at org.netbeans.modules.localhistory.LocalHistory.setRoots(LocalHistory.java:128)
        at org.netbeans.modules.localhistory.LocalHistory.access$000(LocalHistory.java:71)
        at org.netbeans.modules.localhistory.LocalHistory$2$1.run(LocalHistory.java:239)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)