mtasc: command not found

Have You tried accessing the binary with the full path?

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/mtasc - from package: mtasc

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