mx-run: 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/mx-run - from package: libmoosex-runnable-perl

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

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