Exception in thread "main" java.lang.ClassFormat Error

I am running a java program in NeBeans and when I run the program I am getting the following error:
Exception in thread "main" java.lang.ClassFormatError: Repetitive method name/signature in class file pluginex2/TtsoapcgiPortType_addLink_ResponseStruct_SOAPSerializer
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at pluginex2.Ttsoapcgi_SerializerRegistry.getRegistry(Ttsoapcgi_SerializerRegistry.java:73)
at pluginex2.Ttsoapcgi_Impl.<init>(Ttsoapcgi_Impl.java:25)
at pluginex2.Main.main(Main.java:25)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
What should I do?Can anyone please help me out?
Thanks,
Sravanthi.

The class files are automatically into the build/generated/wsclient/project-name file of my project.
I copied those class files into my source folder to make my program work.When I searched my system I jus found two of these files in build/generated/wsclient/project-name folder and source folder of my project.
I am running the program directly through NetBeans IDE.

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    Stef

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