vflserver: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/vflserver - from package: vflib3-bin

You may install the required package with command apt-get install {package}

Error in other languages:
vflserver: bevel nie gevind nie
vflserver: comandă negăsită
vflserver: comando não encontrado
vflserver: commande introuvable
vflserver: command not found
vflserver: käsku ei ole
vflserver: không tìm thấy lệnh
vflserver: komanda nerasta
vflserver: Kommando nicht gefunden.
vflserver: kommandot finns inte
vflserver: komut yok
vflserver: nie znaleziono polecenia
vflserver: níor aimsíodh an t-ordú
vflserver: no se encontró la orden
vflserver: no s'ha trobat l'ordre
vflserver: opdracht niet gevonden
vflserver: parancs nem található
vflserver: perintah tidak ditemukan
vflserver: príkaz nenájdený
vflserver: příkaz nenalezen
vflserver: команда не найдена
vflserver: командата не е открита
vflserver: 命令找不到
vflserver: コマンドが見つかりません