プラグインマネージャを開くとエラーで落ちるんだけど、
原因わかる人いないかな？

jre-1.6.0-03
jEdit 4.3-pre12

エラーメッセージ
java.lang.NoClassDefFoundError: org/gjtsp/jedit/pluginmgr/PluginManager
at org.gjt.sp.jedit.pluginmgr.PluginManager.init(PluginManager.java:163)
at org.gjt.sp.jedit.pluginmgr.PluginManager.<init>(PluginManager.java:149)
at org.gjt.sp.jedit.pluginmgr.PluginManager.showPluginManager(PluginManager.java:102)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.gjt.sp.jedit.bsh.Reflect.invokeMethod(Reflect.java:134)
at org.gjt.sp.jedit.bsh.Reflect.invokeStaticMethod(Reflect.java:98)
at org.gjt.sp.jedit.bsh.Name.invokeMethod(Name.java:871)
at org.gjt.sp.jedit.bsh.BSHMethodInvocation.eval(BSHMethodInvocation.java:75)
at org.gjt.sp.jedit.bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:102)
at org.gjt.sp.jedit.bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:47)
at org.gjt.sp.jedit.bsh.BSHBlock.evalBlock(BSHBlock.java:130)
at org.gjt.sp.jedit.bsh.BSHBlock.eval(BSHBlock.java:80)
at org.gjt.sp.jedit.bsh.BshMethod.invokeImpl(BshMethod.java:362)
at org.gjt.sp.jedit.bsh.BshMethod.invoke(BshMethod.java:258)
at org.gjt.sp.jedit.bsh.BshMethod.invoke(BshMethod.java:186)
at org.gjt.sp.jedit.BeanShell.runCachedBlock(BeanShell.java:509)
at org.gjt.sp.jedit.BeanShellAction.invoke(BeanShellAction.java:76)
at org.gjt.sp.jedit.gui.InputHandler.invokeAction(InputHandler.java:418)
at org.gjt.sp.jedit.jEdit$3.invokeAction(jEdit.java:2967)
at org.gjt.sp.jedit.EditAction$Wrapper.actionPerformed(EditAction.java:264)
(以下略