Error that i've never been able to fix

im getting this error when i try to run my Grapher.jar file
Failed to load Main-Class manifest attribute from
C:\Documents and Settings\PlasmaLink\Desktop\Java\Grapher\dist\Grapher.jar
does anyone know what causes this and how to fix it?
I jsut made this program and all the classes in Netbeans 5.5, and i did build Main project which creates the jar file.
Anyone know how to create a manifest file???
i can run it from a .bat file, by doing
java -cp "C:\Documents and Settings\PlasmaLink\Desktop\Java\Grapher\dist\Grapher.jar" Graph.Main
but not by double clicking the jar file, any help is appreciated.
The jar file never seems to want to run, I did get it to work once for another program.
Message was edited by:
PlasmaLink
Message was edited by:
PlasmaLink

When you build the .jar you have to specify the class that has the main method It'll be in the options for exporting to a jar file somewhere, I'm not really familiar with netbeans.
The reason the command line works is because you're actually saying get all the classes in the .jar and then run the class with the main method.

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