java.lang.ClassNotFoundException: edu.umd.cs.findbugs.BugCategory
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Caused: java.lang.ClassNotFoundException: edu.umd.cs.findbugs.BugCategory starting from ModuleCL@16b277f[org.netbeans.modules.findbugs] with possible defining loaders null and declared parents [ModuleCL@a193fe[org.openide.dialogs], ModuleCL@487c5f[org.netbeans.spi.editor.hints], org.netbeans.MainImpl$BootClassLoader@1ffbd68, ModuleCL@db95a1[org.netbeans.modules.options.api], ModuleCL@1b6a053[org.openide.awt], ModuleCL@392814[org.netbeans.api.progress], ModuleCL@e8787a[org.netbeans.modules.refactoring.api], ModuleCL@1c354e6[org.openide.loaders], ModuleCL@164de59[org.openide.text], ModuleCL@904f75[org.netbeans.libs.findbugs], ...7 more]
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:264)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Caused: java.lang.NoClassDefFoundError: edu/umd/cs/findbugs/BugCategory
   at java.lang.Class.getDeclaredMethods0(Class.java:0)
   at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
   at java.lang.Class.getDeclaredMethod(Class.java:1935)
   at java.awt.Component.isCoalesceEventsOverriden(Component.java:5975)
   at java.awt.Component.access$500(Component.java:169)
   at java.awt.Component$3.run(Component.java:5929)
   at java.awt.Component$3.run(Component.java:5927)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.awt.Component.checkCoalescing(Component.java:5926)
   at java.awt.Component.<init>(Component.java:5895)
   at java.awt.Container.<init>(Container.java:249)
   at javax.swing.JComponent.<init>(JComponent.java:570)
   at javax.swing.JPanel.<init>(JPanel.java:65)
   at javax.swing.JPanel.<init>(JPanel.java:92)
   at javax.swing.JPanel.<init>(JPanel.java:100)
   at org.netbeans.modules.findbugs.options.FindBugsPanel.<init>(FindBugsPanel.java:99)
   at org.netbeans.modules.findbugs.options.FindBugsOptionsPanelController.getPanel(FindBugsOptionsPanelController.java:102)
   at org.netbeans.modules.findbugs.options.FindBugsOptionsPanelController.getComponent(FindBugsOptionsPanelController.java:89)
   at org.netbeans.modules.findbugs.options.FindBugsOptionsPanelController.getComponent(FindBugsOptionsPanelController.java:51)
   at org.netbeans.modules.options.editor.FolderBasedController.getComponent(FolderBasedController.java:198)
   at org.netbeans.modules.options.TabbedController.handleTabSwitched(TabbedController.java:198)
   at org.netbeans.modules.options.TabbedController.access$200(TabbedController.java:79)
   at org.netbeans.modules.options.TabbedController$2.stateChanged(TabbedController.java:106)
   at javax.swing.JTabbedPane.fireStateChanged(JTabbedPane.java:400)
   at javax.swing.JTabbedPane$ModelListener.stateChanged(JTabbedPane.java:253)
   at javax.swing.DefaultSingleSelectionModel.fireStateChanged(DefaultSingleSelectionModel.java:116)
   at javax.swing.DefaultSingleSelectionModel.setSelectedIndex(DefaultSingleSelectionModel.java:50)
   at javax.swing.JTabbedPane.setSelectedIndexImpl(JTabbedPane.java:599)
   at javax.swing.JTabbedPane.setSelectedIndex(JTabbedPane.java:574)
   at javax.swing.plaf.basic.BasicTabbedPaneUI$Handler.mousePressed(BasicTabbedPaneUI.java:3628)
   at javax.swing.plaf.synth.SynthTabbedPaneUI$1.mousePressed(SynthTabbedPaneUI.java:279)
   at java.awt.Component.processMouseEvent(Component.java:6287)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6055)
   at java.awt.Container.processEvent(Container.java:2039)
   at java.awt.Component.dispatchEventImpl(Component.java:4653)
   at java.awt.Container.dispatchEventImpl(Container.java:2097)
   at java.awt.Component.dispatchEvent(Component.java:4481)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4575)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4233)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4166)
   at java.awt.Container.dispatchEventImpl(Container.java:2083)
   at java.awt.Window.dispatchEventImpl(Window.java:2482)
   at java.awt.Component.dispatchEvent(Component.java:4481)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648)
   at java.awt.EventQueue.access$000(EventQueue.java:84)
   at java.awt.EventQueue$1.run(EventQueue.java:607)
   at java.awt.EventQueue$1.run(EventQueue.java:605)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
   at java.awt.EventQueue$2.run(EventQueue.java:621)
   at java.awt.EventQueue$2.run(EventQueue.java:619)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:618)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)