vdmfec: 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/vdmfec - from package: vdmfec

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

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