djvuxmlparser: 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/djvuxmlparser - from package: djvulibre

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

On Debian possible default full paths are:

/usr/bin/djvuxmlparser - from package: djvulibre-bin

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

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