stamppdf: 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/stamppdf - from package: libcam-pdf-perl

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

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