Oracle bad magic 1,’Bad magic number’ Exception

I am getting the same exception in applet program. Bellow is the stack trace..

Java Plug-in 1.6.0_10-rc2

Using JRE version 1.6.0_10-rc2 Java HotSpot(TM) Client VM

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

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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

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

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java.lang.ClassFormatError: Incompatible magic value 218762506 in class file com/sns/legal/esi/PrintControlApplet/class

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

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

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

at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)

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

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

at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)

at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)

at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)

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

Exception: java.lang.ClassFormatError: Incompatible magic value 218762506 in class file com/sns/legal/esi/PrintControlApplet/class

Please suggest..