java.util.ConcurrentModificationException
        at java.util.IdentityHashMap$IdentityHashMapIterator.nextIndex(IdentityHashMap.java:715)
        at java.util.IdentityHashMap$KeyIterator.next(IdentityHashMap.java:804)
        at org.netbeans.modules.timers.InstanceWatcher.contains(InstanceWatcher.java:78)
        at org.netbeans.modules.timers.InstanceWatcher.add(InstanceWatcher.java:72)
        at org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.add(TimesCollectorPeer.java:214)
        at org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.access$000(TimesCollectorPeer.java:189)
        at org.netbeans.modules.timers.TimesCollectorPeer.reportReference(TimesCollectorPeer.java:104)
        at org.netbeans.modules.timers.Install$TimerHandler.publish(Install.java:114)
        at java.util.logging.Logger.log(Logger.java:472)
        at org.netbeans.modules.css.gsf.CSSGSFParser.parseFiles(CSSGSFParser.java:135)
        at org.netbeans.napi.gsfret.source.Source.moveToPhase(Source.java:1011)
        at org.netbeans.napi.gsfret.source.CompilationController.toPhase(CompilationController.java:112)
        at org.netbeans.modules.refactoring.ruby.plugins.RubyWhereUsedQueryPlugin$FindTask.run(RubyWhereUsedQueryPlugin.java:354)
        at org.netbeans.modules.refactoring.ruby.plugins.RubyWhereUsedQueryPlugin$FindTask.run(RubyWhereUsedQueryPlugin.java:337)
        at org.netbeans.napi.gsfret.source.Source.runModificationTask(Source.java:645)
        at org.netbeans.modules.refactoring.ruby.plugins.RubyRefactoringPlugin.processFiles(RubyRefactoringPlugin.java:227)
        at org.netbeans.modules.refactoring.ruby.plugins.RubyWhereUsedQueryPlugin.prepare(RubyWhereUsedQueryPlugin.java:287)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:406)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:390)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:207)
        at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:787)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
An error occurred during parsing of 'C:\Users\Sunbon\Documents\NetBeansProjects\Depot\app\views\store\_cart.rhtml'. Please report a bug against RHTML and attach dump file 'C:\Users\Sunbon\.netbeans\dev\var\log\_cart.rhtml.dump'.