java.lang.IndexOutOfBoundsException: off < 0 || len < 0 || off+len > b.length || off+len < 0!
   at javax.imageio.stream.MemoryCacheImageInputStream.read(MemoryCacheImageInputStream.java:100)
   at com.sun.imageio.plugins.gif.GIFImageReader.getCode(GIFImageReader.java:321)
   at com.sun.imageio.plugins.gif.GIFImageReader.read(GIFImageReader.java:924)
   at javax.imageio.ImageIO.read(ImageIO.java:1448)
   at javax.imageio.ImageIO.read(ImageIO.java:1400)
   at org.netbeans.modules.form.editors.CustomIconEditor$IconFileItem.<init>(CustomIconEditor.java:548)
   at org.netbeans.modules.form.editors.CustomIconEditor.createFileComboModel(CustomIconEditor.java:510)
   at org.netbeans.modules.form.editors.CustomIconEditor.setPackage(CustomIconEditor.java:326)
   at org.netbeans.modules.form.editors.CustomIconEditor.setFromResourceName(CustomIconEditor.java:231)
   at org.netbeans.modules.form.editors.CustomIconEditor.setValue(CustomIconEditor.java:178)
   at org.netbeans.modules.form.editors.IconEditor.getCustomEditor(IconEditor.java:231)
   at org.netbeans.modules.form.ResourceWrapperEditor.createCustomEditorGUI(ResourceWrapperEditor.java:329)
   at org.netbeans.modules.form.ResourceWrapperEditor.getCustomEditor(ResourceWrapperEditor.java:218)
   at org.netbeans.modules.form.FormPropertyEditor.getCustomEditor(FormPropertyEditor.java:319)
   at org.openide.explorer.propertysheet.PropertyDialogManager.<init>(PropertyDialogManager.java:132)
   at org.openide.explorer.propertysheet.CustomEditorAction.actionPerformed(CustomEditorAction.java:221)
   at org.openide.explorer.propertysheet.SheetTable.processMouseEvent(SheetTable.java:823)
   at java.awt.Component.processEvent(Component.java:6270)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4861)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4489)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2719)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:708)
   at java.awt.EventQueue$4.run(EventQueue.java:706)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)