xmp: 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/xmp - from package: xmp

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

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