java.lang.NullPointerException
   at org.qcc.modules.learningpalette.PaletteManager.reloadPaletteItems(PaletteManager.java:162)
   at org.qcc.modules.learningpalette.PaletteManager.<init>(PaletteManager.java:38)
   at org.qcc.modules.learningpalette.PaletteManager.getInstance(PaletteManager.java:195)
   at org.qcc.modules.learningpalette.SourceFilePaletteFactory.createPalette(SourceFilePaletteFactory.java:41)
   at sun.reflect.GeneratedMethodAccessor63.invoke(GeneratedMethodAccessor63.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:497)
   at org.netbeans.core.startup.layers.BinaryFS$AttrImpl$MethodAndParams.invoke(BinaryFS.java:773)
   at org.netbeans.core.startup.layers.BinaryFS$AttrImpl.getValue(BinaryFS.java:703)
   at org.netbeans.core.startup.layers.BinaryFS$BFSBase.getAttribute(BinaryFS.java:549)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:944)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:877)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:940)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:877)
   at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:798)
   at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1432)
   at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:846)
   at org.netbeans.modules.editor.mimelookup.impl.FolderPathLookup$ICItem.getInstance(FolderPathLookup.java:261)
   at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:422)
   at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:222)
   at org.netbeans.modules.editor.mimelookup.impl.SwitchLookup.lookup(SwitchLookup.java:90)
   at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:222)
   at org.netbeans.spi.palette.PaletteSwitch.getPaletteFromMimeType(PaletteSwitch.java:237)
   at org.netbeans.spi.palette.PaletteSwitch.getPaletteFromTopComponent(PaletteSwitch.java:217)
   at org.netbeans.spi.palette.PaletteSwitch.findNewPalette(PaletteSwitch.java:347)
   at org.netbeans.spi.palette.PaletteSwitch.access$000(PaletteSwitch.java:79)
   at org.netbeans.spi.palette.PaletteSwitch$1.run(PaletteSwitch.java:162)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)