start-dynamometer-cluster.sh doesn't print help message as expected

[sunchao]

I got this:

sunchao@HOST:~/dynamometer$ bin/start-dynamometer-cluster.sh -help
18/07/30 21:54:29 INFO dynamometer.Client: Initializing Client
18/07/30 21:54:29 FATAL dynamometer.Client: Error running Client
org.apache.commons.cli.MissingOptionException: Missing required option: [-hadoop_binary_path Location of Hadoop binary to be deployed (archive). One of this or hadoop_version is required., -hadoop_version Version of Hadoop (like '2.7.4' or '3.0.0-beta1') for which to download a binary. If this is specified, a Hadoop tarball will be downloaded from an Apache mirror. By default the Berkeley OCF mirror is used; specify dyno.apache-mirror as a configuration or system property to change which mirror is used. The tarball will be downloaded to the working directory. One of this or hadoop_binary_path is required.]
        at org.apache.commons.cli.Parser.checkRequiredOptions(Parser.java:299)
        at org.apache.commons.cli.Parser.parse(Parser.java:231)
        at org.apache.commons.cli.Parser.parse(Parser.java:85)
        at com.linkedin.dynamometer.Client.init(Client.java:323)
        at com.linkedin.dynamometer.Client.run(Client.java:228)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
        at com.linkedin.dynamometer.Client.main(Client.java:220)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.hadoop.util.RunJar.run(RunJar.java:234)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:148)

while trying to get helper message from the script. It seems I need to pass argument for hadoop_binary_path but is it really necessary for the -help option?