Cross-Site Replication: impossible to start the cron job with guest as the user used for exporting purpose

Impossible to start a replication of the imported demo site (default site) into a newly freshly created empty site B (same template set - only FR). In attachment, my settings. BTW: please modify the default exemple from: (exemple : http://localhost:8080/jahia/Jahia) to (exemple : http://localhost:8080/cms) which is now the default provided settings preconfigured with Jahia.

2009-04-15 11:00:00,437: ERROR [org.jahia.services.importexport.ProductionJob] - Production job execute fail for site cron to target http://localhost:8080/cms/
java.io.IOException
at org.jahia.services.importexport.ImportExportBaseService.exportToSite(ImportExportBaseService.java:1733)
at org.jahia.services.importexport.ImportExportBaseService$$FastClassByCGLIB$$de1c40f7.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:113)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635)
at org.jahia.services.importexport.ImportExportBaseService$$EnhancerByCGLIB$$ccf8e728.exportToSite(<generated>)
at org.jahia.services.importexport.ProductionJob.executeJahiaJob(ProductionJob.java:119)
at org.jahia.services.scheduler.BackgroundJob.execute(BackgroundJob.java:164)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
2009-04-15 11:00:00,437: INFO [org.jahia.services.scheduler.BackgroundJob] - Background job (of type production) ended with status successful executed in 0s