Hello, I am suddenly facing this problem when I try to edit a page in xwiki. The changes get saved when I refresh the url however on saving it gives the following stack trace. Any ideas why this happens and how to avoid it? Regards, Mrudula A problem occured while trying to service your request. Please contact the support if this happens again. Detailed information: Error number 13007 in 3: Exception while loading lock Wrapped Exception: could not execute query com.xpn.xwiki.XWikiException: Error number 13007 in 3: Exception while loading lock Wrapped Exception: could not execute query at com.xpn.xwiki.store.XWikiHibernateStore.loadLock(XWikiHibernateStore.jav a:1549) at com.xpn.xwiki.doc.XWikiDocument.getLock(XWikiDocument.java:2117) at com.xpn.xwiki.XWikiService.actionSave(XWikiService.java:446) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:155) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:1 48) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:86 9) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.proc essConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint .java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollow erWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool .java:684) at java.lang.Thread.run(Unknown Source) Wrapped Exception: java.sql.SQLException: Unknown collation '#48' in table 'xwikilock.frm' definition at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2847) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1531) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1622) at com.mysql.jdbc.Connection.execSQL(Connection.java:2376) at com.mysql.jdbc.Connection.execSQL(Connection.java:2297) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java: 1860) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:170 5) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(Delegat ingPreparedStatement.java:92) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(Delegat ingPreparedStatement.java:92) at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:118 ) at org.hibernate.loader.Loader.getResultSet(Loader.java:1239) at org.hibernate.loader.Loader.doQuery(Loader.java:374) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loade r.java:210) at org.hibernate.loader.Loader.doList(Loader.java:1562) at org.hibernate.loader.Loader.list(Loader.java:1545) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java: 271) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:840) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74) at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java :603) at com.xpn.xwiki.store.XWikiHibernateStore.loadLock(XWikiHibernateStore.jav a:1539) at com.xpn.xwiki.doc.XWikiDocument.getLock(XWikiDocument.java:2117) at com.xpn.xwiki.XWikiService.actionSave(XWikiService.java:446) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:155) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:1 48) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:86 9) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.proc essConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint .java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollow erWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool .java:684) at java.lang.Thread.run(Unknown Source) The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. 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