[standalone@embedded /]  /subsystem=modcluster/proxy=modcluster:add(advertise=false,proxies=mod_cluster-pro14:56:17,909 WARN  [org.jboss.as.cli.impl.ValueTypeCompleter] (CLI Terminal Connection (uninterruptable)) Invalid syntax.: org.jboss.as.cli.CommandFormatException: Invalid syntax.
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.ValueTypeCompleter$ValueTypeCallbackHandler.enteredState(ValueTypeCompleter.java:951)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser$ParsingContextImpl.enterState(StateParser.java:420)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.ValueTypeCompleter$PropertyListState$1.handle(ValueTypeCompleter.java:1248)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser$ParsingContextImpl.enterState(StateParser.java:421)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.ValueTypeCompleter$InitialValueState$1.handle(ValueTypeCompleter.java:1184)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser$ParsingContextImpl.parse(StateParser.java:261)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser.doParse(StateParser.java:150)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser.parseLine(StateParser.java:124)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser.parseLine(StateParser.java:117)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser.parseLine(StateParser.java:95)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser.parseLine(StateParser.java:75)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.parsing.StateParser.parse(StateParser.java:65)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.ValueTypeCompleter.parse(ValueTypeCompleter.java:401)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.ValueTypeCompleter.complete(ValueTypeCompleter.java:381)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.operation.OperationRequestCompleter.completeWithValueCompleter(OperationRequestCompleter.java:413)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.operation.OperationRequestCompleter.completeProperties(OperationRequestCompleter.java:672)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.operation.OperationRequestCompleter.complete(OperationRequestCompleter.java:709)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.operation.OperationRequestCompleter.complete(OperationRequestCompleter.java:90)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.CommandCompleter.complete(CommandCompleter.java:99)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.aesh.CLICompletionHandler.completeLegacyCommands(CLICompletionHandler.java:157)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.aesh.CLICompletionHandler.complete(CLICompletionHandler.java:133)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.CLICommandCompleter.doComplete(CLICommandCompleter.java:132)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.CLICommandCompleter.complete(CLICommandCompleter.java:54)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.aesh.CLICompletionHandler.complete(CLICompletionHandler.java:69)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.aesh.CLICompletionHandler.complete(CLICompletionHandler.java:45)
            at org.aesh//org.aesh.readline.completion.CompletionHandler.createCompletionList(CompletionHandler.java:135)
            at org.aesh//org.aesh.readline.completion.CompletionHandler.complete(CompletionHandler.java:103)
            at org.aesh//org.aesh.readline.action.mappings.Complete.accept(Complete.java:62)
            at org.aesh//org.aesh.readline.Readline$AeshInputProcessor.parse(Readline.java:246)
            at org.aesh//org.aesh.readline.Readline$AeshInputProcessor.access$100(Readline.java:174)
            at org.aesh//org.aesh.readline.Readline.readInput(Readline.java:95)
            at org.aesh//org.aesh.readline.Readline.access$1000(Readline.java:57)
            at org.aesh//org.aesh.readline.Readline$AeshInputProcessor.lambda$start$1(Readline.java:333)
            at org.aesh//org.aesh.terminal.EventDecoder.accept(EventDecoder.java:118)
            at org.aesh//org.aesh.terminal.EventDecoder.accept(EventDecoder.java:31)
            at org.aesh//org.aesh.io.Decoder.write(Decoder.java:133)
            at org.aesh//org.aesh.readline.tty.terminal.TerminalConnection.openBlocking(TerminalConnection.java:216)
            at org.aesh//org.aesh.readline.tty.terminal.TerminalConnection.openBlocking(TerminalConnection.java:203)
            at org.jboss.as.cli@7.0.1.Final-redhat-00001//org.jboss.as.cli.impl.ReadlineConsole$CLITerminalConnection.lambda$null$1(ReadlineConsole.java:178)
            at java.base/java.lang.Thread.run(Thread.java:834)
     
     
    {
        "outcome" => "failed",
        "failure-description" => "WFLYCTL0155: 'listener' may not be null",
        "rolled-back" => true
    }