这个错误循环出现，帮我看看怎么改啊

voacom

版本:        X5.2.7        小版本号:                       
数据库:        Oracle        服务器操作系统:        Windows        应用服务器:        Tomcat
客户端操作系统:        Windows 7        浏览器:        IE10               
严重: Servlet.service() for servlet JustepDocFileServlet threw exception
org.outerj.daisy.runtime.DaisyRTException: RepositoryException
        at com.justep.doc.httpconnector.HttpConnector.service(Unknown Source)
        at com.justep.doc.httpconnector.FileServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:595)
Caused by: org.outerj.daisy.repository.DocumentNotFoundException: A document with id 83-root does not exist.
        at org.outerj.daisy.repository.serverimpl.LocalDocumentStrategy.loadDocumentInTransaction(Unknown Source)
        at org.outerj.daisy.repository.serverimpl.LocalDocumentStrategy.load(Unknown Source)

lixin_justep

这是打开什么功能做什么操作报错？