Some kind of IOException must have been thrown.
Could you please attach the exception (IDE log) located in USER_HOME (.netbeans)/var/log. 

Are there all references, from FinancialData.wsdl, available ?

Or, if you could attach your wsdl file ?

OK. I saw that IDE wanted to copy file into one directory that was in use by another process (after deleting; I do many iterations of deleting/creating) and the message appear. When I killed the process, removed directory (find: ‘./xml-resources/web-service-references/FinancialData’: Permission denied) and restarted NetBeans, it started working. So the only issue is misleading message text.

The exception from message.log:

Caused: java.io.FileNotFoundException: Can't read <project>\xml-resources\web-service-references\FinancialData

	at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.getInputStream(FileObj.java:192)

[catch] at org.openide.loaders.DefaultDataObject.fixCookieSet(DefaultDataObject.java:262)

	at org.openide.loaders.DefaultDataObject.checkCookieSet(DefaultDataObject.java:221)

	at org.openide.loaders.MultiDataObject$ChangeAndBefore.beforeLookup(MultiDataObject.java:1455)

	at org.openide.nodes.CookieSetLkp.beforeLookupImpl(CookieSetLkp.java:146)

	at org.openide.nodes.CookieSet.getCookie(CookieSet.java:173)

	at org.openide.loaders.MultiDataObject.getCookie(MultiDataObject.java:953)

	at org.openide.loaders.DefaultDataObject.getCookie(DefaultDataObject.java:233)

	at org.openide.loaders.DefaultDataObject.getCookie(DefaultDataObject.java:214)

	at org.openide.loaders.DataNode.getCookie(DataNode.java:435)

	at org.openide.nodes.NodeLookup.addCookie(NodeLookup.java:100)

	at org.openide.nodes.NodeLookup.updateLookupAsCookiesAreChanged(NodeLookup.java:192)

	at org.openide.nodes.NodeLookup.beforeLookup(NodeLookup.java:163)

	at org.openide.util.lookup.AbstractLookup.lookupItem(AbstractLookup.java:427)

	at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:421)

	at org.openide.nodes.FilterNode$FilterLookup.lookup(FilterNode.java:2125)

	at org.netbeans.modules.project.ui.PhysicalView$ProjectIconNode.swap(PhysicalView.java:401)

	at org.netbeans.modules.project.ui.PhysicalView$ProjectIconNode.getIcon(PhysicalView.java:394)

	at org.openide.nodes.FilterNode.getIcon(FilterNode.java:557)

	at org.openide.explorer.view.VisualizerNode.getIcon(VisualizerNode.java:558)

	at org.openide.explorer.view.NodeRenderer.configureFrom(NodeRenderer.java:215)

	at org.openide.explorer.view.NodeRenderer.getTreeCellRendererComponent(NodeRenderer.java:147)

	at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:2786)

	at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:492)

	at javax.swing.tree.FixedHeightLayoutCache.getBounds(FixedHeightLayoutCache.java:552)

	at javax.swing.tree.FixedHeightLayoutCache.getBounds(FixedHeightLayoutCache.java:198)

	at javax.swing.tree.AbstractLayoutCache.getPreferredWidth(AbstractLayoutCache.java:245)

	at javax.swing.plaf.basic.BasicTreeUI.updateCachedPreferredSize(BasicTreeUI.java:1882)

	at javax.swing.plaf.basic.BasicTreeUI.getPreferredSize(BasicTreeUI.java:1985)

	at javax.swing.plaf.basic.BasicTreeUI.getPreferredSize(BasicTreeUI.java:1973)

	at javax.swing.JComponent.getPreferredSize(JComponent.java:1660)

	at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:790)

	at org.openide.explorer.view.TreeView$ExplorerScrollPaneLayout.layoutContainer(TreeView.java:1725)

	at java.awt.Container.layout(Container.java:1503)

	at java.awt.Container.doLayout(Container.java:1492)

	at java.awt.Container.validateTree(Container.java:1688)

	at java.awt.Container.validate(Container.java:1623)

	at org.openide.explorer.view.TreeView.access$101(TreeView.java:151)

	at org.openide.explorer.view.TreeView$3.run(TreeView.java:670)

	at org.openide.util.Mutex.readAccess(Mutex.java:372)

	at org.openide.util.Mutex$1R.run(Mutex.java:1314)

	at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1921)

	at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1333)

	at org.openide.util.Mutex.readAccess(Mutex.java:361)

	at org.openide.explorer.view.TreeView.validate(TreeView.java:667)

	at javax.swing.JViewport.validateView(JViewport.java:485)

	at javax.swing.JViewport.scrollRectToVisible(JViewport.java:396)

	at javax.swing.JComponent.scrollRectToVisible(JComponent.java:3108)

	at org.openide.explorer.view.BeanTreeView.showPathWithoutExpansion(BeanTreeView.java:178)

	at org.openide.explorer.view.BeanTreeView.showPath(BeanTreeView.java:161)

	at org.netbeans.modules.project.ui.ProjectTab$ProjectTreeView.access$1800(ProjectTab.java:706)

	at org.netbeans.modules.project.ui.ProjectTab$ProjectTreeView$2.run(ProjectTab.java:781)

	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)

	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)

	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:300)

	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)

	at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)

	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)

ALL [null]: Cannot read file FinancialData in <project>\xml-resources\web-service-references.

Thanks.

This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue.

Thanks for your cooperation,
NetBeans IDE 8.2 Release Boss