java.io.FileNotFoundException: 
   at org.netbeans.modules.apisupport.project.layers.WritableXMLFileSystem.createFileOrFolder(WritableXMLFileSystem.java:438)
   at org.netbeans.modules.apisupport.project.layers.WritableXMLFileSystem.createFolder(WritableXMLFileSystem.java:452)
   at org.openide.filesystems.AbstractFileObject.createFolder(AbstractFileObject.java:415)
   at org.openide.filesystems.FileUtil.createFolder(FileUtil.java:894)
   at org.openide.filesystems.FileUtil.createData(FileUtil.java:949)
   at org.openide.filesystems.MultiFileObject.createData(MultiFileObject.java:1175)
   at org.openide.filesystems.FileUtil.createData(FileUtil.java:970)
   at org.openide.filesystems.MultiFileSystem.maskFile(MultiFileSystem.java:614)
   at org.openide.filesystems.MultiFileObject.handleDelete(MultiFileObject.java:1337)
   at org.openide.filesystems.AbstractFolder.delete(AbstractFolder.java:999)
   at org.openide.filesystems.MultiFileObject.needsMask(MultiFileObject.java:1617)
   at org.openide.filesystems.MultiFileObject.handleDelete(MultiFileObject.java:1336)
   at org.openide.filesystems.AbstractFolder.delete(AbstractFolder.java:999)
   at org.openide.loaders.FileEntry.delete(FileEntry.java:137)
   at org.openide.loaders.MultiDataObject.handleDelete(MultiDataObject.java:631)
   at org.openide.loaders.DataObject$4.run(DataObject.java:648)
   at org.openide.loaders.DataObject$1WrapRun.run(DataObject.java:890)
   at org.openide.loaders.DataObjectPool$1WrapAtomicAction.run(DataObjectPool.java:261)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:607)
   at org.openide.loaders.DataObjectPool.runAtomicAction(DataObjectPool.java:273)
   at org.openide.loaders.DataObject.invokeAtomicAction(DataObject.java:910)
   at org.openide.loaders.DataObject.delete(DataObject.java:646)
   at org.openide.loaders.DataShadow$ShadowNode.destroy(DataShadow.java:965)
   at org.openide.nodes.FilterNode.destroy(FilterNode.java:613)
   at org.netbeans.modules.refactoring.spi.impl.SafeDeleteAction$2.run(SafeDeleteAction.java:178)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:607)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:602)
   at org.netbeans.modules.refactoring.spi.impl.SafeDeleteAction.delete(SafeDeleteAction.java:173)
   at org.netbeans.modules.openide.explorer.ExplorerActionsImpl$DeleteActionPerformer.actionPerformed(ExplorerActionsImpl.java:627)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:93)
   at org.openide.util.actions.ActionInvoker$ActionRunnable.actionPerformed(ActionInvoker.java:162)
   at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:109)
   at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:60)
   at org.openide.util.actions.ActionInvoker$ActionRunnable.doRun(ActionInvoker.java:153)
   at org.openide.util.actions.ActionInvoker$2.run(ActionInvoker.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)