Problem creating Scaladoc

The "Generate Scaladoc" option under Tools doesn’t work for me. It brings up the “Specify Generate Scaladoc Scope” dialog box but pressing OK does nothing. No error messages of any kind. I'm running with Scala 2.10 and IntelliJ 13.1.2 under Windows. The Scala plugin seems to be working fine otherwise.  I did check the intellij.log file and found the error (below).  Any thoughts?

2014-05-22 20:21:32,568 [16032766]  ERROR - llij.ide.plugins.PluginManager - Argument 0 for @NotNull parameter of com/intellij/execution/runners/ExecutionEnvironmentBuilder.setRunProfile must not be null
java.lang.IllegalArgumentException: Argument 0 for @NotNull parameter of com/intellij/execution/runners/ExecutionEnvironmentBuilder.setRunProfile must not be null
 at com.intellij.execution.runners.ExecutionEnvironmentBuilder.setRunProfile(ExecutionEnvironmentBuilder.java)
 at com.intellij.execution.runners.ExecutionEnvironmentBuilder.setRunnerAndSettings(ExecutionEnvironmentBuilder.java:81)
 at org.jetbrains.plugins.scala.lang.scaladoc.generate.ScaladocAction.analyze(ScaladocAction.scala:41)
 at com.intellij.analysis.BaseAnalysisAction.actionPerformed(BaseAnalysisAction.java:117)
 at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:164)
 at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter$1.run(ActionMenuItem.java:266)
 at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:924)
 at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124)
 at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:236)
 at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
 at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:105)
 at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:512)
 at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:44)
 at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:532)
 at java.awt.Component.processMouseEvent(Component.java:6505)
 at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
 at java.awt.Component.processEvent(Component.java:6270)
 at java.awt.Container.processEvent(Container.java:2229)
 at java.awt.Component.dispatchEventImpl(Component.java:4861)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
 at java.awt.Container.dispatchEventImpl(Container.java:2273)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
 at java.awt.EventQueue.access$200(EventQueue.java:103)
 at java.awt.EventQueue$3.run(EventQueue.java:694)
 at java.awt.EventQueue$3.run(EventQueue.java:692)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
 at java.awt.EventQueue$4.run(EventQueue.java:708)
 at java.awt.EventQueue$4.run(EventQueue.java:706)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
 at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:697)
 at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:520)
 at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:335)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
2014-05-22 20:21:32,570 [16032768]  ERROR - llij.ide.plugins.PluginManager - IntelliJ IDEA 13.1.2  Build #IC-135.690
2014-05-22 20:21:32,570 [16032768]  ERROR - llij.ide.plugins.PluginManager - JDK: 1.7.0_40
2014-05-22 20:21:32,570 [16032768]  ERROR - llij.ide.plugins.PluginManager - VM: Java HotSpot(TM) Server VM
2014-05-22 20:21:32,570 [16032768]  ERROR - llij.ide.plugins.PluginManager - Vendor: Oracle Corporation
2014-05-22 20:21:32,571 [16032769]  ERROR - llij.ide.plugins.PluginManager - OS: Windows 7
2014-05-22 20:21:32,571 [16032769]  ERROR - llij.ide.plugins.PluginManager - Last Action: Scala.GenerateScaladoc