Problem with ftpd-topfield installation

Hi!

I try to make wireless connection to my Topfield TF520Pvrc and Asus WL-500W.
i have use this Oleg's firmware: WL-500W firmware 1.9.2.7-d from 2011.02.19
and configure my connection with this guide: http://www.macsat.com/oldguides/pdf/Oleg_IPKG.pdf

After I have install ipkg and try to install ftpd-topfield it gives error message:
[admin@WL-00248C2740EB root]$ ipkg install ftpd-topfield
Installing ftpd-topfield (0.7.7-0) to root...
Downloading http://ipkg.nslu2-linux.org/feeds/op...7-0_mipsel.ipk
Configuring ftpd-topfield
/opt/etc/init.d/S67ftpd-topfield: line 8: /opt/sbin/ftpd-topfield: not found
postinst script returned status 127
ERROR: ftpd-topfield.postinst returned 127
Successfully terminated.

I try to add /opt/sbin to PATH and it doesn't work.

I hope someone can help me,
Br,
--O