dms_master_down: 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/sbin/dms_master_down - from package: dms-dr

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

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