HTTP ERROR 500

Problem accessing /tim-kiem/JA$.html. Reason:

    Server Error

Caused by:

java.lang.IllegalArgumentException: Illegal group reference: group index is missing
	at java.util.regex.Matcher.appendReplacement(Matcher.java:819)
	at java.util.regex.Matcher.replaceAll(Matcher.java:955)
	at java.lang.String.replaceAll(String.java:2223)
	at org.eclipse.jetty.rewrite.handler.RedirectRegexRule.apply(RedirectRegexRule.java:93)
	at org.eclipse.jetty.rewrite.handler.RegexRule.matchAndApply(RegexRule.java:75)
	at org.eclipse.jetty.rewrite.handler.RuleContainer.apply(RuleContainer.java:169)
	at org.eclipse.jetty.rewrite.handler.RuleContainer.matchAndApply(RuleContainer.java:149)
	at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:330)
	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
	at org.eclipse.jetty.server.Server.handle(Server.java:502)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:750)