vflx11: 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/vflx11 - from package: vflib3-bin

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

Error in other languages:
vflx11: bevel nie gevind nie
vflx11: comandă negăsită
vflx11: comando não encontrado
vflx11: commande introuvable
vflx11: command not found
vflx11: käsku ei ole
vflx11: không tìm thấy lệnh
vflx11: komanda nerasta
vflx11: Kommando nicht gefunden.
vflx11: kommandot finns inte
vflx11: komut yok
vflx11: nie znaleziono polecenia
vflx11: níor aimsíodh an t-ordú
vflx11: no se encontró la orden
vflx11: no s'ha trobat l'ordre
vflx11: opdracht niet gevonden
vflx11: parancs nem található
vflx11: perintah tidak ditemukan
vflx11: príkaz nenájdený
vflx11: příkaz nenalezen
vflx11: команда не найдена
vflx11: командата не е открита
vflx11: 命令找不到
vflx11: コマンドが見つかりません