melting: 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/melting - from package: melting

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

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