java.lang.NullPointerException: This exception has no message.

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at net.sf.robocode.repository.root.ClassPathRoot.visitDirectory(
at net.sf.robocode.repository.root.ClassPathRoot.update(
at net.sf.robocode.repository.root.handlers.ClassPathHandler.visitDirectory(
at net.sf.robocode.repository.root.handlers.RootHandler.visitDirectories(
at net.sf.robocode.repository.Database.update(
at net.sf.robocode.repository.RepositoryManager.refresh(
at net.sf.robocode.repository.RepositoryManager.reload(
at net.sf.robocode.ui.WindowManager.showSplashScreen(

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