紧急求助：cygwin下注册pure-ftp为系统服务出错

平凡的香草

通过命令：
$ cygrunsrv.exe -I pure-ftp-cygwin -p /usr/local/pure-ftp2/sbin/pure-ftpd.exe -
a -lpuredb:/cygdrive/c/cygwin/usr/local/pure-ftp2/etc/PureDB.pdb
将cygwin下的pure-ftp注册为windos系统服务，
但是在登陆的时候出现下面的问题：
220---------- Welcome to Pure-FTPd [TLS] ----------
220-You are user number 1 of 50 allowed.
220-Local time is now 14:09. Server port: 21.
220 You will be disconnected after 15 minutes of inactivity.
User (192.168.241.167none)): upload
331 User upload OK. Password required
Password:
421 Unable to read the indexed puredb file (or old format detected) - Try pure-p
w mkdb
Login failed.
ftp>;


另：我在cygwin下启动该pure-ftp服务下正常……