java.lang.IllegalStateException: Warning: multiple instances of shared class org.netbeans.modules.xml.actions.CollectXMLAction created.
        at org.openide.util.SharedClassObject.<init>(SharedClassObject.java:185)
        at org.openide.util.actions.SystemAction.<init>(SystemAction.java:84)
        at org.netbeans.modules.xml.actions.CollectSystemAction.<init>(CollectSystemAction.java:58)
        at org.netbeans.modules.xml.actions.CollectXMLAction.<init>(CollectXMLAction.java:53)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java:0)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at java.lang.Class.newInstance0(Class.java:372)
        at java.lang.Class.newInstance(Class.java:325)
        at org.netbeans.modules.xml.actions.CollectXMLAction.getInstance(CollectXMLAction.java:62)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.netbeans.core.startup.layers.BinaryFS$AttrImpl$MethodAndParams.invoke(BinaryFS.java:603)
        at org.netbeans.core.startup.layers.BinaryFS$AttrImpl.getValue(BinaryFS.java:536)
        at org.netbeans.core.startup.layers.BinaryFS$BFSBase.getAttribute(BinaryFS.java:382)
        at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:844)
        at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:793)
        at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:840)
        at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:793)
        at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:726)
        at org.netbeans.core.startup.layers.BinaryFS$FileMap.get(BinaryFS.java:959)
        at org.openide.awt.AlwaysEnabledAction.getDelegate(AlwaysEnabledAction.java:83)
        at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:126)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:374)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1688)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1732)
        at java.awt.Component.processMouseEvent(Component.java:6108)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:5873)
        at java.awt.Container.processEvent(Container.java:2105)
        at java.awt.Component.dispatchEventImpl(Component.java:4469)
        at java.awt.Container.dispatchEventImpl(Container.java:2163)
        at java.awt.Component.dispatchEvent(Component.java:4295)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4461)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4125)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4055)
        at java.awt.Container.dispatchEventImpl(Container.java:2149)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4295)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)