Export/Import Problem

Folks, Folks, I am trying to export content from one XWiki instance and import into another instance. After I have uploaded the XAR into the second instance and select the archive to import, I see no change on the web page. If I look at the application server log, I see the following set of error messages. Does anyone have any suggestions about what might be going on? Both instances are using the same XWiki build (1.0 Beta-5.2310). I've already increased the max_allowed_packet to 16M in mysql, and so I think the archive is getting attached correctly. Sincerely, David Kane 11015 in 11: Exception while importing Wrapped Exception: Error number 0 in 5: Package: Could not find the package definition com.xpn.xwiki.XWikiException: Error number 11015 in 11: Exception while importing Wrapped Exception: Error number 0 in 5: Package: Could not find the package definition at com.xpn.xwiki.web.ImportAction.render(ImportAction.java:95) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:150) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.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.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) 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:121) 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(Thread.java:613) Wrapped Exception: com.xpn.xwiki.plugin.packaging.PackageException: Error number 0 in 5: Package: Could not find the package definition at com.xpn.xwiki.plugin.packaging.Package.Import(Package.java:338) at com.xpn.xwiki.plugin.packaging.PackageAPI.Import(PackageAPI.java:167) at com.xpn.xwiki.web.ImportAction.render(ImportAction.java:46) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:150) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.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.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) 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:121) 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(Thread.java:613) 13:31:45,261 ERROR http-8080-Processor20 http://localhost:8080/xwiki/bin/import/XWiki/Import?action=getPackageInf os&name=Backup.zip&xpage=plain&_= SimpleLog4JLogSystem:logVelocityMessage:154 - Left side ($!hidecolumns) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. [line 9, column 21] 13:31:45,474 WARN http-8080-Processor20 http://localhost:8080/xwiki/bin/import/XWiki/Import?action=getPackageInf os&name=Backup.zip&xpage=plain&_= MonitorData:log:183 - MONITOR XWiki.Import: 431ms