java.lang.ClassNotFoundException: org.eclipse.mylyn.tasks.core.AbstractRepositoryConnector
   at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.ClassNotFoundException: org.eclipse.mylyn.tasks.core.AbstractRepositoryConnector starting from ModuleCL@ef9ac71[org.netbeans.modules.mylyn.util] with possible defining loaders [Netigso[reference:file:ide/modules/org-apache-commons-logging.jar]] and declared parents [Netigso[netigso://org.netbeans.libs.junit4], Netigso[netigso://org.netbeans.modules.j2eeserver], Netigso[reference:file:ide/modules/org-eclipse-core-runtime-compatibility-auth.jar], org.netbeans.MainImpl$BootClassLoader@7cd84586, ModuleCL@247f7083[org.netbeans.modules.keyring], Netigso[netigso://org.netbeans.api.search], ModuleCL@7f9e5df9[org.netbeans.modules.bugtracking], ModuleCL@2db19c9c[org.netbeans.modules.team.commons], Netigso[reference:file:ide/modules/org-apache-commons-logging.jar], ModuleCL@6fda869f[org.netbeans.modules.spellchecker.apimodule], ...2 more]
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:224)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: org/eclipse/mylyn/tasks/core/AbstractRepositoryConnector
   at org.netbeans.modules.mylyn.util.internal.Accessor.getInstance(Accessor.java:61)
   at org.netbeans.modules.mylyn.util.internal.ModuleLifecycleManager.closing(ModuleLifecycleManager.java:57)
   at org.netbeans.core.startup.NbInstaller.closing(NbInstaller.java:707)
   at org.netbeans.ModuleManager.shutDownAsync(ModuleManager.java:1986)
   at org.netbeans.core.startup.ModuleSystem.shutDownAsync(ModuleSystem.java:349)
   at org.netbeans.core.NbLifeExit.doExit(NbLifeExit.java:137)
   at org.netbeans.core.NbLifeExit.run(NbLifeExit.java:94)
   at org.openide.util.Mutex.doEvent(Mutex.java:1356)
   at org.openide.util.Mutex.readAccess(Mutex.java:355)
   at org.netbeans.core.NbLifecycleManager.exit(NbLifecycleManager.java:213)
   at org.netbeans.core.NbLifecycleManager.exit(NbLifecycleManager.java:119)
   at org.netbeans.core.windows.view.ui.MainWindow$9.windowClosing(MainWindow.java:525)
   at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349)
   at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349)
   at java.awt.Window.processWindowEvent(Window.java:2058)
   at javax.swing.JFrame.processWindowEvent(JFrame.java:297)
   at java.awt.Window.processEvent(Window.java:2017)
   at java.awt.Component.dispatchEventImpl(Component.java:4881)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Window.dispatchEventImpl(Window.java:2739)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
   at java.awt.EventQueue.access$400(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:697)
   at java.awt.EventQueue$3.run(EventQueue.java:691)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:719)
   at java.awt.EventQueue$4.run(EventQueue.java:717)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)