Java SE (Java Platform, Standard Edition)

Hi team,
I am trying to run SerialVer but I am getting an error which I believe has to do with my runtime environment. I am saying that 'cause currently I have two environments installed on my pc (1.4.2 and 1.5.0). I am getting the following error message:

Exception in thread "main" java.lang.NoClassDefFoundError: PINChange (wrong name: com/device/PINChange)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
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 java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at sun.tools.serialver.SerialVer.resolveClass(SerialVer.java:189)
at sun.tools.serialver.SerialVer.serialSyntax(SerialVer.java:161)
at sun.tools.serialver.SerialVer.main(SerialVer.java:270)

I used serialVer of jdk1.5 in order to get this error (obviously I had already compiled this file with this jdk).

Any thought would be helpful.

Thanks in advance.
George