IntelliJ X Breaks DocTree Plugin

IntelliJ X (98.402) gives the error below when I try to launch a browser from the DocTree plugin. It looks like the launchBrowser(String, String) method was changed to private?

Error during dispatching of java.awt.event.MouseEvent[MOUSE_CLICKED,(238,318),absolute(234,314),button=1,modifiers=Button1,clickCount=2] on frame0: com.intellij.ide.BrowserUtil.launchBrowser(Ljava/lang/String;Ljava/lang/String;)V
java.lang.NoSuchMethodError: com.intellij.ide.BrowserUtil.launchBrowser(Ljava/lang/String;Ljava/lang/String;)V
at org.intellij.doctree.ProjectDocs.openDocument(ProjectDocs.java:268)
at org.intellij.doctree.ProjectDocs$1.mouseClicked(ProjectDocs.java:199)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
at java.awt.Component.processMouseEvent(Component.java:6270)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at com.intellij.ui.treeStructure.Tree.processMouseEvent(Tree.java:293)
at java.awt.Component.processEvent(Component.java:6032)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at com.intellij.ide.IdeEventQueue.e(IdeEventQueue.java:655)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:505)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:408)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:372)
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)