java.lang.IllegalArgumentException: File cannot be a directory
   at org.netbeans.modules.web.common.spi.ImportantFilesImplementation$FileInfo.<init>(ImportantFilesImplementation.java:109)
   at org.netbeans.modules.javascript.gulp.file.ImportantFilesImpl$1.create(ImportantFilesImpl.java:63)
   at org.netbeans.modules.web.common.spi.ImportantFilesSupport.getFiles(ImportantFilesSupport.java:107)
   at org.netbeans.modules.javascript.gulp.file.ImportantFilesImpl.getFiles(ImportantFilesImpl.java:75)
   at org.netbeans.modules.web.common.ui.ImportantFiles$ImportantFilesChildren.getImportantFiles(ImportantFiles.java:294)
   at org.netbeans.modules.web.common.ui.ImportantFiles$ImportantFilesChildren.hasImportantFiles(ImportantFiles.java:257)
   at org.netbeans.modules.web.common.ui.ImportantFiles$ImportantFilesNodeList.keys(ImportantFiles.java:144)
   at org.netbeans.spi.project.ui.support.NodeFactorySupport$DelegateChildren$1.run(NodeFactorySupport.java:202)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)