java.lang.NullPointerException

[SapitoFresh]

Si, tengo creada una carpeta "/imagenes/rostro" con 27 imagenes.
El error que arroja apunta a las lineas donde se encuentra el metodo "cargarImagenes()" y ell arreglo de imagenes"imagen[i-1] = new ImageIcon(getClass().getResource(nombre))".
Espero su ayuda.
Gracias.

Por si las dudas copio y pego las lineas de error :

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:205)
at problema01.PanelPrincipal.cargarImagenes(PanelPrin cipal.java:21)
at problema01.PanelPrincipal.<init>(PanelPrincipal.ja va:9)
at problema01.Principal.<init>(Principal.java:16)
at problema01.Principal$1.run(Principal.java:66)
at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:727)
at java.awt.EventQueue.access$200(EventQueue.java:103 )
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege (ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 697)
at java.awt.EventDispatchThread.pumpOneEventForFilter s (EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter (EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarch y (EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:91)