debugging - Java is reporting errors running the A+ Learning System. Any ideas how to fix them? -

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i work local school district part time. run piece of software called a+ learning system. uses java runtime environment does. on 1 of our computers, isn't running; opening command prompt , typing out:

  java -jar als.jar

gives following error messages.

    c:\als30\alsclient>java -jar als.jar > c:\alsdebuginfo.txt     exception in thread "main" java.lang.noclassdeffounderror: javax/media/controllerlistener      @ java.lang.classloader.defineclass1(native method)      @ java.lang.classloader.defineclasscond(unknown source)      @ java.lang.classloader.defineclass(unknown source)      @ java.security.secureclassloader.defineclass(unknown source)      @ java.net.urlclassloader.defineclass(unknown source)      @ java.net.urlclassloader.access$000(unknown source)      @ java.net.urlclassloader$1.run(unknown source)      @ java.security.accesscontroller.doprivileged(native method)      @ java.net.urlclassloader.findclass(unknown source)      @ java.lang.classloader.loadclass(unknown source)      @ sun.misc.launcher$appclassloader.loadclass(unknown source)      @ java.lang.classloader.loadclass(unknown source)      @ als.checkalsrunning(als.java:1017)      @ als.main(als.java:192)    caused by: java.lang.classnotfoundexception: javax.media.controllerlistener      @ java.net.urlclassloader$1.run(unknown source)      @ java.security.accesscontroller.doprivileged(native method)      @ java.net.urlclassloader.findclass(unknown source)      @ java.lang.classloader.loadclass(unknown source)      @ sun.misc.launcher$appclassloader.loadclass(unknown source)      @ java.lang.classloader.loadclass(unknown source)      ... 14 more

i don't know enough java or a+ learning system able debug stuff. hunch maybe computer running wrong version of java runtime environment. shove in right direction appreciated.

thanks in advance guys.

it looks optional java media framework not installed.

you can here, along installation instructions.


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