mml2json: 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/mml2json - from package: node-carto

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

Error in other languages:
mml2json: bevel nie gevind nie
mml2json: comandă negăsită
mml2json: comando não encontrado
mml2json: commande introuvable
mml2json: command not found
mml2json: käsku ei ole
mml2json: không tìm thấy lệnh
mml2json: komanda nerasta
mml2json: Kommando nicht gefunden.
mml2json: kommandot finns inte
mml2json: komut yok
mml2json: nie znaleziono polecenia
mml2json: níor aimsíodh an t-ordú
mml2json: no se encontró la orden
mml2json: no s'ha trobat l'ordre
mml2json: opdracht niet gevonden
mml2json: parancs nem található
mml2json: perintah tidak ditemukan
mml2json: príkaz nenájdený
mml2json: příkaz nenalezen
mml2json: команда не найдена
mml2json: командата не е открита
mml2json: 命令找不到
mml2json: コマンドが見つかりません