vmgen-0.7.2: 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/vmgen-0.7.2 - from package: gforth

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

Error in other languages:
vmgen-0.7.2: bevel nie gevind nie
vmgen-0.7.2: comandă negăsită
vmgen-0.7.2: comando não encontrado
vmgen-0.7.2: commande introuvable
vmgen-0.7.2: command not found
vmgen-0.7.2: käsku ei ole
vmgen-0.7.2: không tìm thấy lệnh
vmgen-0.7.2: komanda nerasta
vmgen-0.7.2: Kommando nicht gefunden.
vmgen-0.7.2: kommandot finns inte
vmgen-0.7.2: komut yok
vmgen-0.7.2: nie znaleziono polecenia
vmgen-0.7.2: níor aimsíodh an t-ordú
vmgen-0.7.2: no se encontró la orden
vmgen-0.7.2: no s'ha trobat l'ordre
vmgen-0.7.2: opdracht niet gevonden
vmgen-0.7.2: parancs nem található
vmgen-0.7.2: perintah tidak ditemukan
vmgen-0.7.2: príkaz nenájdený
vmgen-0.7.2: příkaz nenalezen
vmgen-0.7.2: команда не найдена
vmgen-0.7.2: командата не е открита
vmgen-0.7.2: 命令找不到
vmgen-0.7.2: コマンドが見つかりません