java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.api.project.ProjectManager

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java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.api.project.ProjectManager
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.openide.nodes.Children$ProjectManagerDeadlockDetector.callPMMutexMethod(Children.java:1969)
at org.openide.nodes.Children$ProjectManagerDeadlockDetector.getPMMutex(Children.java:1951)
at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1933)
at org.netbeans.modules.openide.util.DefaultMutexImplementation.doWrapperAccess(DefaultMutexImplementation.java:1099)
at org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(DefaultMutexImplementation.java:226)
at org.openide.util.Mutex.readAccess(Mutex.java:260)
at org.openide.loaders.DataObject.getNodeDelegateImpl(DataObject.java:355)
at org.openide.loaders.DataObject.getNodeDelegate(DataObject.java:342)
at org.openide.awt.MenuBar$LazyMenu.updateProps(MenuBar.java:611)
at org.openide.awt.MenuBar$LazyMenu.run(MenuBar.java:630)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)

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