scanpbnj: 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/scanpbnj - from package: pbnj

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

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