pop3认证报错。求救啊！搞了好久了?报错

我这边用的是postfix+windows_ad+courier+authlib+extmail这个方案
用telnet localhost 110测试的时候maillog中报错如下：
有没有知道原因的啊！
Dec 13 15:57:03 mail authdaemond: authldaplib: sysusername=<null>, sysuserid=1000, sysgroupid=1000, homedir=/data/vmail/fff, address=fff, fullname=fff, maildir=fff, quota=<null>, options=<null>
Dec 13 15:57:03 mail authdaemond: authldaplib: clearpasswd=<null>, passwd=<null>
Dec 13 15:57:03 mail authdaemond: rebinding with DN 'CN=fff,OU=mailuser,DC=fengwu,DC=com' to validate password
Dec 13 15:57:03 mail authdaemond: authentication bind successful
Dec 13 15:57:03 mail authdaemond: Authenticated: sysusername=<null>, sysuserid=1000, sysgroupid=1000, homedir=/data/vmail/fff, address=fff, fullname=fff, maildir=fff, quota=<null>, options=<null>
Dec 13 15:57:03 mail authdaemond: Authenticated: clearpasswd=Aa123456, passwd=<null>
Dec 13 15:57:03 mail pop3d: fff: chdir(/data/vmail/fff) failed!!
Dec 13 15:57:03 mail pop3d: error: No such file or directory
Dec 13 15:57:03 mail pop3d: LOGIN FAILED, user=fff, ip=[::ffff:192.168.234.136]
Dec 13 15:57:03 mail pop3d: authentication error: No such file or directory