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

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java.lang.NullPointerException:
at net.sf.robocode.repository.root.ClassPathRoot.visitDirectory(ClassPathRoot.java:82)
at net.sf.robocode.repository.root.ClassPathRoot.update(ClassPathRoot.java:51)
at net.sf.robocode.repository.root.handlers.ClassPathHandler.visitDirectory(ClassPathHandler.java:36)
at net.sf.robocode.repository.root.handlers.RootHandler.visitDirectories(RootHandler.java:35)
at net.sf.robocode.repository.Database.update(Database.java:48)
at net.sf.robocode.repository.RepositoryManager.refresh(RepositoryManager.java:97)
at net.sf.robocode.repository.RepositoryManager.reload(RepositoryManager.java:121)
at net.sf.robocode.ui.WindowManager.showSplashScreen(WindowManager.java:353)
at net.sf.robocode.core.RobocodeMain.run(RobocodeMain.java:134)
at java.lang.Thread.run(Thread.java:636)

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