pyxbdump: 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 CentOS possible default full paths are:

/usr/bin/pyxbdump - from package: PyXB

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/pyxbdump - from package: python-pyxb

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

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