On launch of IntelliJ IDEA 9 there is a plugin error involving Clover

com/intellij/util/ui/treetable/TreeTableTree: com/intellij/util/ui/treetable/TreeTableTree
java.lang.NoClassDefFoundError: com/intellij/util/ui/treetable/TreeTableTree
at com.cenqua.clover.idea.CloverToolWindow.getCoveragePane(CloverToolWindow.java:180)
at com.cenqua.clover.idea.CloverToolWindow.initComponents(CloverToolWindow.java:111)
at com.cenqua.clover.idea.CloverToolWindow.<init>(CloverToolWindow.java:67)
at com.cenqua.clover.idea.CloverToolWindow.getInstance(CloverToolWindow.java:57)
at com.cenqua.clover.idea.ProjectPlugin.projectPostStartup(ProjectPlugin.java:113)
at com.cenqua.clover.idea.ProjectPlugin$1.run(ProjectPlugin.java:73)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:748)
at com.intellij.ide.startup.impl.StartupManagerImpl$4.run(StartupManagerImpl.java:200)
at com.intellij.ide.startup.impl.StartupManagerImpl.a(StartupManagerImpl.java:175)
at com.intellij.ide.startup.impl.StartupManagerImpl.access$100(StartupManagerImpl.java:39)
at com.intellij.ide.startup.impl.StartupManagerImpl$2.run(StartupManagerImpl.java:144)
at com.intellij.openapi.project.DumbServiceImpl.a(DumbServiceImpl.java:167)
at com.intellij.openapi.project.DumbServiceImpl.access$1000(DumbServiceImpl.java:49)
at com.intellij.openapi.project.DumbServiceImpl$IndexUpdateRunnable$1$2.run(DumbServiceImpl.java:289)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at com.intellij.ide.IdeEventQueue.f(IdeEventQueue.java:621)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:511)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:372)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)