pfsoutexr: 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/pfsoutexr - from package: pfstools

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

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