.run-sml: 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/lib/smlnj/bin/.run-sml - from package: smlnj-runtime

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

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