mlmmj-make-ml: 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/mlmmj-make-ml - from package: mlmmj

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

On Debian possible default full paths are:

/usr/bin/mlmmj-make-ml - from package: mlmmj

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

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