FTP server [SOLVED]

I have installed SFTP and working very well but i need FTP .I try from this link FTP server OpenWrt but i have

root@Arduino:~# opkg install vsftpd
Unknown package 'vsftpd'.
Collected errors:

  • opkg_install_cmd: Cannot install package vsftpd.

Try

#opkg update

before #opkg install

dualcei:
Try

#opkg update

before #opkg install

Thank You dualcei i tried again and now working, i don't know why before not working but i made few changes, restart to default factory mode, install PHP,MySQL .