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Exception occured on a xwiki user site with document section editing:

A problem occured while trying to service your request. Please contact the support if this happens again.

Detailed information:

Error number 0 in 11: Uncaught exception

Wrapped Exception: Index: 0, Size: 0

com.xpn.xwiki.XWikiException: Error number 0 in 11: Uncaught exception

Wrapped Exception: Index: 0, Size: 0

at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:223)

at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)

at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)

at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)

at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)

at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:117)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)

at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)

at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)

at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)

at java.lang.Thread.run(Unknown Source)

Wrapped Exception:

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

at java.util.ArrayList.RangeCheck(Unknown Source)

at java.util.ArrayList.get(Unknown Source)

at com.xpn.xwiki.doc.XWikiDocument.getDocumentSection(XWikiDocument.java:4009)

at com.xpn.xwiki.doc.XWikiDocument.updateDocumentSection(XWikiDocument.java:4054)

at com.xpn.xwiki.web.SaveAction.save(SaveAction.java:100)

at com.xpn.xwiki.web.SaveAction.action(SaveAction.java:129)

at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:197)