cannot launch Flux capacitor

I got this error after running the script in the unzipped folder. Sorry I am a newbie of Java.

dongx@ummsres10:~/src/flux-capacitor-1.2.3/bin$ flux-capacitor --help
Exception in thread "main" java.lang.NoClassDefFoundError: barna/commons/launcher/Flux
Caused by: java.lang.ClassNotFoundException: barna.commons.launcher.Flux
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: barna.commons.launcher.Flux. Program will exit.