[rules-users] Jar

Hi! Yesterday I tried to jar my Drools application. At first I got a few errors trying to jar (error opening zip file) in the version CR1. Finally I tried a downgrade to M5, and the jar seemed to be created correctly (using the export function of eclipse). But when I tried to run the jar, something went wrong, my application doesn't run as it should. How can I make een runnable jar of my Drools application? Thx, Femke