synchronize the ldap server

I am using Microsoft active directory 2003 as LDAP server.While synchronize my domain the following error is coming

An exception caught while persisting Users.

2007-11-14 11:09:01,781 ERROR [com.adobe.idp.um.businesslogic.directoryservices.DirectorySynchronizationManagerBean] UserM:DIRSYNC: [Thread Hashcode: 2744714] transactReadUsers on: [PrincipalDomainEntity: pan_dir epoch:1 state:STARTED ] failed: com.adobe.idp.common.errors.exception.IDPSystemException: nullorigin: | [com.adobe.idp.um.provider.directoryservices.LDAPDirectoryPrincipalProviderImpl] errorCode:8193 errorCodeHEX:0x2001 message:retrieving record value chainedException:java.lang.NullPointerExceptionchainedExceptionMessage:null chainedException trace:java.lang.NullPointerException

please help me.