mltex: 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/mltex - from package: texlive

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

On Debian possible default full paths are:

/usr/bin/mltex - from package: texlive-formats-extra

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

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