What exactly is your main directory
Code:
java.lang.ClassNotFoundException: org.jvnet.substance.skin.SubstanceChallengerDe
epLookAndFeel
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at javax.swing.SwingUtilities.loadSystemClass(Unknown Source)
at javax.swing.UIManager.setLookAndFeel(Unknown Source)
at Gui.<init>(Gui.java:31)
at Gui.main(Gui.java:26)
Press any key to continue . . .