java.lang.NullPointerException: The sources[0] parameter cannot be null
   at org.openide.util.Parameters.notNull(Parameters.java:89)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:103)
   at org.netbeans.modules.web.jsf.editor.el.JsfELVariableResolver.getFaceletParameters(JsfELVariableResolver.java:283)
   at org.netbeans.modules.web.jsf.editor.el.JsfELVariableResolver.getJsfManagedBeans(JsfELVariableResolver.java:252)
   at org.netbeans.modules.web.jsf.editor.el.JsfELVariableResolver.getBeanName(JsfELVariableResolver.java:133)
   at org.netbeans.modules.web.el.ELVariableResolvers$2.get(ELVariableResolvers.java:107)
   at org.netbeans.modules.web.el.ELVariableResolvers$2.get(ELVariableResolvers.java:102)
   at org.netbeans.modules.web.el.CompilationCache.getOrCache(CompilationCache.java:58)
   at org.netbeans.modules.web.el.ELVariableResolvers.findBeanName(ELVariableResolvers.java:100)
   at org.netbeans.modules.web.el.refactoring.ELWhereUsedQuery.handleClass(ELWhereUsedQuery.java:145)
   at org.netbeans.modules.web.el.refactoring.ELWhereUsedQuery$1.run(ELWhereUsedQuery.java:130)
   at org.netbeans.modules.web.el.refactoring.ELWhereUsedQuery$1.run(ELWhereUsedQuery.java:113)
   at org.netbeans.modules.java.source.parsing.MimeTask.run(MimeTask.java:83)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:380)
   at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:363)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:334)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:415)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:407)
   at org.netbeans.modules.web.el.refactoring.ELWhereUsedQuery.prepare(ELWhereUsedQuery.java:113)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:442)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:426)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:237)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare$2.run(ParametersPanel.java:1055)
   at org.openide.util.RequestProcessor$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)