problem using netbeans

[corvenik]

When i run jpcsp this is what shows

Code:

run:
Exception in thread "GUI" java.lang.NullPointerException
        at javax.swing.ImageIcon.<init>(ImageIcon.java:167)
        at jpcsp.MainGUI.initComponents(MainGUI.java:592)
        at jpcsp.MainGUI.<init>(MainGUI.java:124)
        at jpcsp.MainGUI$39.run(MainGUI.java:1515)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
BUILD SUCCESSFUL (total time: 5 seconds)

if i use the launcher i get an error: "Could not find the main class: jpcsp.ManGUI. Program will exit" (I check the main project properties and i see that "jpcsp.MainGUI" is set as the main class).

Its strange because like a month ago i could compile working versions of jpcsp with netbeans...
any idea of what im doing wrong?

btw im going to try with eclipse