Problem with javacard WebApplication

I'm trying to build a javacard webapplication with netbeans, but I'm getting a build error and don't know how to fix it:

    [Error] Unable to parse the class file webapplication2/WebApplication2.class. Exception while looking for class webapplication2.WebApplication2: java.io.IOException: Couldnt find: webapplication2/WebApplication2.class. Packager/create FAILED [1 error(s) and 0 warning(s)]

Whats wrong here? I just used the stand开发者_如何学编程ard template for a javacard web application of Netbeans.

thanks

The javacard libraries aren't working on Mac OS X. But are running without problems on Windows XP