Eclipse plugin not working (for me)

Question

I installed plugin as instructed but the following (apparently correct) diagram results in an error message: "an error has occurred : java.lang.IllegalArgumentException: Not a H or V line!"

Offending diagram:

```

@startuml
start
:Initialization;
if (fatal error) then (bail out)
    #orangered:Log critical: <error reason>;
    stop
else (normal behavior)
    fork
        repeat :LRM subscribe(Global)\ncallback function;
            :check command;
            :queue command>
        repeat while
        kill
    fork again
        repeat :Dequeue\nGlobal command<
            :analyze command;
            :execute command;
        repeat while
        kill
    fork again
        repeat :LRM subscribe(Chime)\ncallback function;
            :check command;
            :queue command>
        repeat while
        kill
    fork again
        repeat :dequeue Chime command\nwith timeout (> 1s)<
            if (timeout) then (timeout)
                :queue cleanup;
            else (command available)
                :queue scan;
                :analyze command;
                :execute command;
            endif
        repeat while
        kill
    end fork
    stop
endif
@enduml

```

I *think* it's a problem with an old plantuml.jar, but I have no idea how to upgrade it.