oarnotify: 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/oarnotify - from package: oar-server

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

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