java.lang.ClassFormatError: Incompatible magic value 1013474657 in class fi

Can anyone please tell me why I'm getting the following error and how to fix it. Thank you

Java Plug-in 1.6.0_01

Using JRE version 1.6.0_01 Java HotSpot(TM) Client VM

User home directory = C:\Documents and Settings\Administrator

-

c:clear console window

f:finalize objects on finalization queue

g:garbage collect

h:display this help message

l:dump classloader list

m:print memory usage

o:trigger logging

p:reload proxy configuration

q:hide console

r:reload policy configuration

s:dump system and deployment properties

t:dump thread list

v:dump thread stack

x:clear classloader cache

0-5: set trace level to <n>

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java.lang.ClassFormatError: Incompatible magic value 1013474657 in class file DlogGrapher

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at sun.applet.AppletClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.applet.AppletClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.applet.AppletClassLoader.loadCode(Unknown Source)

at sun.applet.AppletPanel.createApplet(Unknown Source)

at sun.plugin.AppletViewer.createApplet(Unknown Source)

at sun.applet.AppletPanel.runLoader(Unknown Source)

at sun.applet.AppletPanel.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

[1610 byte] By [bill721a] at [2007-11-27 10:31:49]
# 1

Chucking "Incompatible magic value Java" in google returns:

http://forum.java.sun.com/thread.jspa?threadID=640927&tstart=255

It looks helpful.

mlka at 2007-7-28 18:12:13 > top of Java-index,Java Essentials,New To Java...
# 2

the why -- are you sending classes compiled with 1.6 into a runtime that MUST have classes compiled with a lower version? Are you using 1.6 features? If not, try compiling for 1.5 (javac -source 1.5).

kris.richardsa at 2007-7-28 18:12:13 > top of Java-index,Java Essentials,New To Java...