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java.lang.IllegalArgumentException: Illegal group reference	at java.util.regex.Matcher.appendReplacement(Matcher.java:808)	at java.util.regex.Matcher.replaceAll(Matcher.java:906)	at java.lang.String.replaceAll(String.java:2162)	at com.mirth.connect.server.util.AttachmentUtil.reAttachMessage(AttachmentUtil.java:35)	at com.mirth.connect.server.util.DICOMUtil.reAttachMessage(DICOMUtil.java:170)	at org.mule.providers.TemplateValueReplacer.loadContextFromMessageObject(TemplateValueReplacer.java:161)	at org.mule.providers.TemplateValueReplacer.replaceValues(TemplateValueReplacer.java:85)	at org.mule.providers.TemplateValueReplacer.replaceValues(TemplateValueReplacer.java:79)	at com.mirth.connect.connectors.vm.VMMessageDispatcher.routeTemplatedMessage(VMMessageDispatcher.java:178)	at com.mirth.connect.connectors.vm.VMMessageDispatcher.doSend(VMMessageDispatcher.java:265)	at org.mule.providers.AbstractMessageDispatcher.send(AbstractMessageDispatcher.java:164)	at org.mule.impl.MuleSession.sendEvent(MuleSession.java:191)	at org.mule.impl.MuleSession.sendEvent(MuleSession.java:130)	at org.mule.routing.outbound.AbstractOutboundRouter.send(AbstractOutboundRouter.java:85)	at org.mule.routing.outbound.FilteringMulticastingRouter.route(FilteringMulticastingRouter.java:54)	at org.mule.routing.outbound.OutboundMessageRouter$1.doInTransaction(OutboundMessageRouter.java:78)	at org.mule.transaction.TransactionTemplate.execute(TransactionTemplate.java:48)	at org.mule.routing.outbound.OutboundMessageRouter.route(OutboundMessageRouter.java:82)	at org.mule.impl.model.DefaultMuleProxy.onCall(DefaultMuleProxy.java:247)	at org.mule.impl.model.seda.SedaComponent.doSend(SedaComponent.java:209)	at org.mule.impl.model.AbstractComponent.sendEvent(AbstractComponent.java:277)	at org.mule.impl.MuleSession.sendEvent(MuleSession.java:201)	at org.mule.routing.inbound.InboundMessageRouter.send(InboundMessageRouter.java:176)	at org.mule.routing.inbound.InboundMessageRouter.route(InboundMessageRouter.java:143)	at org.mule.providers.AbstractMessageReceiver$DefaultInternalMessageListener.onMessage(AbstractMessageReceiver.java:487)	at org.mule.providers.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:266)	at org.mule.providers.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:225)	at com.mirth.connect.connectors.vm.VMMessageReceiver.getMessages(VMMessageReceiver.java:222)	at org.mule.providers.TransactedPollingMessageReceiver.poll(TransactedPollingMessageReceiver.java:108)	at org.mule.providers.PollingMessageReceiver.run(PollingMessageReceiver.java:97)	at org.mule.impl.work.WorkerContext.run(WorkerContext.java:290)	at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)	at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:575)	at java.lang.Thread.run(Thread.java:724)