java.lang.AssertionError: Null methodName. Signature: [visibleProperty()], Names: [visiblePropertyclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait] at org.netbeans.modules.java.source.TreeLoader$3.setParamNames(TreeLoader.java:572) at org.netbeans.modules.java.source.TreeLoader$3.handleStartTag(TreeLoader.java:493) at javax.swing.text.html.parser.DocumentParser.handleStartTag(DocumentParser.java:160) at javax.swing.text.html.parser.Parser.startTag(Parser.java:437) at javax.swing.text.html.parser.Parser.parseTag(Parser.java:1948) at javax.swing.text.html.parser.Parser.parseContent(Parser.java:2066) at javax.swing.text.html.parser.Parser.parse(Parser.java:2233) at javax.swing.text.html.parser.DocumentParser.parse(DocumentParser.java:122) at javax.swing.text.html.parser.ParserDelegator.parse(ParserDelegator.java:101) at org.netbeans.modules.java.source.TreeLoader.getParamNamesFromJavadocText(TreeLoader.java:443) at org.netbeans.modules.java.source.TreeLoader.loadParamNames(TreeLoader.java:231) at com.sun.tools.javac.code.Symbol$ParamSymbol.getSimpleName(Symbol.java:1087) at com.sun.tools.javac.code.Symbol$ParamSymbol.getSimpleName(Symbol.java:1053) at org.netbeans.modules.editor.java.JavaCompletionItem$MethodItem.(JavaCompletionItem.java:1420) at org.netbeans.modules.editor.java.JavaCompletionItem$MethodItem.(JavaCompletionItem.java:1374) at org.netbeans.modules.editor.java.JavaCompletionItem.createExecutableItem(JavaCompletionItem.java:184) at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.addMembers(JavaCompletionProvider.java:3097) at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.insideMemberSelect(JavaCompletionProvider.java:1703) at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.resolveCompletion(JavaCompletionProvider.java:640) at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:407) at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery$Task.run(JavaCompletionProvider.java:5113) at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:583) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:150) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:134) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:200) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:197) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:168) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:72) at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:197) at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:102) at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:294) at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032) Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.AssertionError: Null methodName. Signature: [visibleProperty()], Names: [visiblePropertyclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait]