Liferay 与 OpenLdap用户同步问题

我使用的是liferay6.1.2 + cas3.5 + OpenLdap 搭建的门户和统一认证，通过liferay自带的Ldap用户同步机制同步用户，但只能同步1000左右的用户并不能再继续同步报如下错误！另外同步liferay登录未同步成功的用户的方式也能同步过来！但毕竟太麻烦！有解决过同样问题的高手给予帮助！谢谢！

04:29:41,864 ERROR [liferay/scheduler_dispatch-22][PortalLDAPImporterImpl:213] Error importing LDAP users and groups
javax.naming.CommunicationException: [LDAP: error code 2 - paged results cookie is invalid]; remaining name 'ou=users,dc=sitc,dc=com'
        at com.sun.jndi.ldap.LdapCtx.mapErrorCode(LdapCtx.java:3115)
        at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:3013)
        at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2820)
        at com.sun.jndi.ldap.LdapCtx.searchAux(LdapCtx.java:1829)
        at com.sun.jndi.ldap.LdapCtx.c_search(LdapCtx.java:1752)
        at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_search(ComponentDirContext.java:368)
        at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:338)
        at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:321)
        at javax.naming.directory.InitialDirContext.search(InitialDirContext.java:248)
        at com.liferay.portal.security.ldap.PortalLDAPUtil.searchLDAP(PortalLDAPUtil.java:760)
        at com.liferay.portal.security.ldap.PortalLDAPUtil.getUsers(PortalLDAPUtil.java:557)
        at com.liferay.portal.security.ldap.PortalLDAPUtil.getUsers(PortalLDAPUtil.java:592)
        at com.liferay.portal.security.ldap.PortalLDAPImporterImpl.importFromLDAPByUser(PortalLDAPImporterImpl.java:691)
        at com.liferay.portal.security.ldap.PortalLDAPImporterImpl.importFromLDAP(PortalLDAPImporterImpl.java:206)
        at com.liferay.portal.security.ldap.PortalLDAPImporterImpl.importFromLDAP(PortalLDAPImporterImpl.java:142)
        at com.liferay.portal.security.ldap.PortalLDAPImporterImpl.importFromLDAP(PortalLDAPImporterImpl.java:101)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.liferay.portal.security.lang.DoPrivilegedHandler.doInvoke(DoPrivilegedHandler.java:88)
        at com.liferay.portal.security.lang.DoPrivilegedHandler.invoke(DoPrivilegedHandler.java:56)
        at $Proxy410.importFromLDAP(Unknown Source)
        at com.liferay.portal.security.ldap.PortalLDAPImporterUtil.importFromLDAP(PortalLDAPImporterUtil.java:39)
        at com.liferay.portlet.admin.messaging.LDAPImportMessageListener.doReceive(LDAPImportMessageListener.java:51)
        at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:26)
        at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67)
        at $Proxy606.receive(Unknown Source)
        at com.liferay.portal.kernel.scheduler.messaging.SchedulerEventMessageListenerWrapper.receive(SchedulerEventMessageListenerWrapper.java:76)
        at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:72)
        at com.liferay.portal.kernel.messaging.ParallelDestination$1.run(ParallelDestination.java:69)
        at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:678)
        at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:589)
        at java.lang.Thread.run(Thread.java:662)