java.lang.ClassNotFoundException: org.netbeans.api.language.util.lex.LexUtil
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
Caused: java.lang.ClassNotFoundException: org.netbeans.api.language.util.lex.LexUtil starting from ModuleCL@124614c[org.netbeans.modules.scala.refactoring] with possible defining loaders [ModuleCL@18eabf6[org.netbeans.modules.scala.core]] and declared parents [ModuleCL@19f90e3[org.netbeans.modules.csl.api], ModuleCL@b2c64[org.netbeans.modules.editor.lib], ModuleCL@103d246[org.openide.io], ModuleCL@c3e967[org.netbeans.modules.java.source], ModuleCL@1cd3dd7[org.netbeans.libs.javacapi], ModuleCL@d78df0[org.netbeans.modules.projectapi], ModuleCL@c07527[org.openide.loaders], ModuleCL@df9095[org.netbeans.modules.java.project], ModuleCL@cd6aa0[org.netbeans.api.java.classpath], ModuleCL@10eeb26[org.jdesktop.layout], ...21 more]
        at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:261)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Caused: java.lang.NoClassDefFoundError: org/netbeans/api/language/util/lex/LexUtil
        at java.lang.Class.getDeclaredConstructors0(Class.java:0)
        at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
        at java.lang.Class.getConstructor0(Class.java:2699)
        at java.lang.Class.newInstance0(Class.java:326)
        at java.lang.Class.newInstance(Class.java:308)
        at org.openide.util.lookup.MetaInfServicesLookup$P.createInstance(MetaInfServicesLookup.java:553)
        at org.openide.util.lookup.MetaInfServicesLookup$P.getInstance(MetaInfServicesLookup.java:450)
        at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:1003)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:489)
        at org.netbeans.modules.refactoring.api.impl.ActionsImplementationFactory.canRename(ActionsImplementationFactory.java:58)
        at org.netbeans.modules.refactoring.spi.impl.RenameAction.enable(RenameAction.java:74)
        at org.netbeans.modules.refactoring.spi.impl.RefactoringGlobalAction.enable(RefactoringGlobalAction.java:136)
        at org.openide.util.actions.NodeAction.isEnabled(NodeAction.java:206)
        at org.openide.awt.Actions$MenuBridge.updateState(Actions.java:1023)
        at org.openide.awt.Actions.connect(Actions.java:184)
        at org.openide.awt.Actions.connect(Actions.java:151)
        at org.openide.awt.Actions$MenuItem.<init>(Actions.java:1345)
        at org.netbeans.modules.openide.awt.DefaultAWTBridge.createMenuPresenter(DefaultAWTBridge.java:68)
        at org.openide.util.actions.CallableSystemAction.getMenuPresenter(CallableSystemAction.java:88)
        at org.openide.awt.DynaMenuModel.loadSubmenu(DynaMenuModel.java:93)
        at org.openide.awt.MenuBar$LazyMenu$MenuFolder.createInstance(MenuBar.java:713)
        at org.openide.loaders.FolderInstance.defaultProcessObjectsFinal(FolderInstance.java:870)
        at org.openide.loaders.FolderInstance$1R.run(FolderInstance.java:735)
        at org.openide.util.Task.run(Task.java:245)
        at org.netbeans.modules.openide.loaders.AWTTask.run(AWTTask.java:70)
        at org.netbeans.modules.openide.loaders.AWTTask$Processor.run(AWTTask.java:111)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)