vptovf: 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 CentOS possible default full paths are:

/usr/bin/vptovf - from package: texlive

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/vptovf - from package: texlive-binaries

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

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