mpto: 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/mpto - from package: texlive

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

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