java.lang.ClassNotFoundException: org.netbeans.modules.cnd.api.project.NativeFileItemSet
   at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.ClassNotFoundException: org.netbeans.modules.cnd.api.project.NativeFileItemSet starting from ModuleCL@b1a8438[org.netbeans.modules.cnd.modelimpl] with possible defining loaders null and declared parents [ModuleCL@635d6591[org.openide.loaders], ModuleCL@4163c61[org.netbeans.modules.cnd.utils], ModuleCL@59a03fef[org.netbeans.modules.cnd.repository.api], ModuleCL@6af5e140[org.netbeans.modules.cnd.api.model], ModuleCL@202a3d5c[org.netbeans.modules.editor.lib], ModuleCL@6c3c6feb[org.netbeans.modules.cnd.lexer], ModuleCL@7e8132ba[org.netbeans.modules.cnd.antlr], ModuleCL@7a1cd2c0[org.openide.nodes], org.netbeans.MainImpl$BootClassLoader@50ed0a5, ModuleCL@40134dbd[org.netbeans.modules.cnd.modelutil], ...15 more]
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:224)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: org/netbeans/modules/cnd/api/project/NativeFileItemSet
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport$ModifiedObjectsChangeListener.editStart(ModelSupport.java:560)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport$ModifiedObjectsChangeListener.stateChanged(ModelSupport.java:660)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.openide.loaders.DataObject$ModifiedRegistry.add(DataObject.java:1372)
   at org.openide.loaders.DataObject$ModifiedRegistry.add(DataObject.java:1343)
   at java.util.Collections$SynchronizedCollection.add(Collections.java:1636)
   at org.openide.loaders.DataObject.setModified(DataObject.java:504)
   at org.openide.text.DataEditorSupport$Env.markModified(DataEditorSupport.java:957)
   at org.openide.text.CloneableEditorSupport.notifyModified(CloneableEditorSupport.java:2073)
   at org.netbeans.modules.nbform.FormEditorSupport.notifyModified(FormEditorSupport.java:768)
   at org.netbeans.modules.nbform.FormEditorSupport.markModified(FormEditorSupport.java:616)
   at org.netbeans.modules.form.FormEditor$4.formChanged(FormEditor.java:893)
   at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:1327)
   at org.netbeans.modules.form.FormModel.fireEventBatch(FormModel.java:1300)
   at org.netbeans.modules.form.FormModel.firePendingEvents(FormModel.java:1263)
   at org.netbeans.modules.form.FormModel.access$000(FormModel.java:68)
   at org.netbeans.modules.form.FormModel$2.run(FormModel.java:1240)
   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:0)
   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)