vfldisol: 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/vfldisol - from package: vflib3-bin

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

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