PyCharm error ...

Hi, I got the following error when I tried to start PyCharm this morning.  It was working fine yesterday and I didn't change anything.  What do I need to do to fix it? PyCharm V3.1.1 on Mac OS X V10.8.5.  Thanks.

Plugin 'JavaScriptDebugger' failed to initialize and will be disabled. Please restart PyCharm.

java.lang.NoClassDefFoundError: com/intellij/lang/javascript/json/JSONLanguageDialect
java.lang.NoClassDefFoundError: com/intellij/lang/javascript/json/JSONLanguageDialect
 at com.jetbrains.javascript.debugger.sourcemap.SourceMapFileType.<init>(SourceMapFileType.java:21)
 at com.jetbrains.javascript.debugger.sourcemap.SourceMapFileType.<clinit>(SourceMapFileType.java:16)
 at com.jetbrains.javascript.debugger.sourcemap.SourceMapFileType$MyFileTypeFactory.createFileTypes(SourceMapFileType.java:50)
 at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.a(FileTypeManagerImpl.java:155)
 at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.initComponent(FileTypeManagerImpl.java:284)
 at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter$1.getComponentInstance(ComponentManagerImpl.java:548)
 at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:590)
 at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:225)
 at com.intellij.util.pico.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:212)
 at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:199)
 at org.picocontainer.alternatives.AbstractDelegatingMutablePicoContainer.getComponentInstance(AbstractDelegatingMutablePicoContainer.java:75)
 at com.intellij.openapi.components.impl.ComponentManagerImpl.createComponent(ComponentManagerImpl.java:121)
 at com.intellij.openapi.application.impl.ApplicationImpl.createComponent(ApplicationImpl.java:372)
 at com.intellij.openapi.components.impl.ComponentManagerImpl.a(ComponentManagerImpl.java:112)
 at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:89)
 at com.intellij.openapi.components.impl.stores.ApplicationStoreImpl.load(ApplicationStoreImpl.java:87)
 at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:509)
 at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:150)
 at com.intellij.idea.MainImpl$1$1$1.run(MainImpl.java:59)
 at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)
 at java.awt.EventQueue.access$400(EventQueue.java:82)
 at java.awt.EventQueue$2.run(EventQueue.java:676)
 at java.awt.EventQueue$2.run(EventQueue.java:674)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)
 at com.intellij.ide.IdeEventQueue.e(IdeEventQueue.java:697)
 at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:524)
 at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:335)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.ClassNotFoundException: com.intellij.lang.javascript.json.JSONLanguageDialect PluginClassLoader[JavaScriptDebugger, 1.0]
 at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:68)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 ... 36 more

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