Jar will not launch after upgrading a project to Netbeans 6.5

Hi,
I created a project in NetBeans about 2 years ago, then I upgraded the project to NetBeans 6.5 just now. The .jar file that is created when I build the project gives me the error:
C:\>java -jar Checkers.jar
Exception in thread "main" java.lang.NullPointerException
at sun.launcher.LauncherHelper.getMainClassFromJar(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
If I create a new project in NetBeans, the jar file it creates will work correctly. It seems to be something related to the upgrade or maybe the state of the original project (I didn't try the .jar file when I was running with the old version of NetBeans.)
Anyway, I need to know how to make the fix from within NetBeans. I look at the project properties and there is an entry point defined. It runs fine from within NetBeans. I don't know what changes to make in the project config to fix this.
Thanks,
Bill N.
Cincinnati, OH

First, these forums are for Java language questions, not NB configuration and support questions. If you wish to pursue this question further, please do it at the NB site.
NB has tutorials and FAQs that show how to configure a project so that it can be executed outside of the NB IDE.

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