pildriver: 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/pildriver - from package: python3-pil

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

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