Can someone please explain to me why I get this error?

I'm using a free google voice api. Now when I try to run it I get this error


Microsoft Windows [Version 6.1.7601]
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Copyright (c) 2009 Microsoft Corporation. All rights reserved.
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C:\Users\*>cd desktop
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C:\Users\*\Desktop>java -jar voice.jar
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Exception in thread "main" java.lang.NoClassDefFoundError: gvjava/org/json/JSONE
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xception
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at java.lang.Class.getDeclaredMethods0(Native Method)
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at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
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at java.lang.Class.getMethod0(Unknown Source)
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at java.lang.Class.getMethod(Unknown Source)
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at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
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at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
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Caused by: java.lang.ClassNotFoundException: gvjava.org.json.JSONException
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at java.net.URLClassLoader$1.run(Unknown Source)
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at java.net.URLClassLoader$1.run(Unknown Source)
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at java.security.AccessController.doPrivileged(Native Method)
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at java.net.URLClassLoader.findClass(Unknown Source)
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at java.lang.ClassLoader.loadClass(Unknown Source)
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at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
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at java.lang.ClassLoader.loadClass(Unknown Source)
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... 6 more
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C:\Users\*\Desktop>

The api is here http://code.google.com/p/google-voice-java/
I am using the latest download
The api source is here http://google-voice-java.googlecode.com/svn/trunk/src/

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