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stanzabookrestore.jar will not launch

I tried to use the java app stanzabookrestore.jar, but I get a message that the app could not be launched, there was an error and I should check the console. Sure enough there was an error or errors. Here they are:

5/31/10 9:12:18 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x10015ca90, p = 0x10015ca94, pEnd = 0x10015ca98)
5/31/10 9:12:18 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x10015ca90, p = 0x10015ca94, pEnd = 0x10015ca98)
5/31/10 9:12:18 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x100138c60, p = 0x100138c64, pEnd = 0x100138c68)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] Exception in thread "main"
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] java.lang.UnsupportedClassVersionError: Bad version number in .class file
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.lang.ClassLoader.defineClass1(Native Method)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.security.AccessController.doPrivileged(Native Method)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
5/31/10 9:12:19 PM [0x0-0xef0ef].com.apple.JarLauncher[16781] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280)

Any suggestions on what this means or how it can be fixed?
Thanks.