truncated class file problem

Hi, I'm having a problem running my app on my iPaq. The Java version is 
1.3.1 and on my desktop it's 1.3.1_13. The app runs fine on my desktop but 
when I try to run it on the PDA i get the following error:

Exception in thread "main" java.lang.ClassFormatError: MapLayer (Truncated 
class
file)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:11
1)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)

I can't tell from the above which of my classes is causing the error. Does 
anyone know why this might be happening? Any help greatly appreciated..

Julie

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