xpstopdf: 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/xpstopdf - from package: libgxps-utils

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

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