empy3: 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/empy3 - from package: python3-empy

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

Error in other languages:
empy3: bevel nie gevind nie
empy3: comandă negăsită
empy3: comando não encontrado
empy3: commande introuvable
empy3: command not found
empy3: käsku ei ole
empy3: không tìm thấy lệnh
empy3: komanda nerasta
empy3: Kommando nicht gefunden.
empy3: kommandot finns inte
empy3: komut yok
empy3: nie znaleziono polecenia
empy3: níor aimsíodh an t-ordú
empy3: no se encontró la orden
empy3: no s'ha trobat l'ordre
empy3: opdracht niet gevonden
empy3: parancs nem található
empy3: perintah tidak ditemukan
empy3: príkaz nenájdený
empy3: příkaz nenalezen
empy3: команда не найдена
empy3: командата не е открита
empy3: 命令找不到
empy3: コマンドが見つかりません