Hello! I have a problem with a java application. I have run the jar file on three differernt computer systems. On two of them, the application works fine, but on the other one, which is the one that I would like to work with this application, it does not run. It throws an exception:

Java Code:
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)

... (blah blah)

Caused by: java.lang.NullPointerException

Could you please help me to solve this? What should I look for?