ImageIcon Exception when I generate code from netbeans 5

Hi,
I want to execute my application from jCreator.I use NetBeans 5 and all seem to be good. When I am trying to run it in jCreator(it is being compiled successfully) but I am getting an Exception :
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init><ImageIcon.java:138>
at project.init.initComponents<init.java:58>
Can anyone help me with this?

Thank you warnerja.
This was the problem.Specifically I am not passing it as null, but I have insert a *.gif icon and it doesn't accepts that instead of netbeans.Did you know the reason?
Thank you again!

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