xvile-to-html: 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/xvile-to-html - from package: xvile

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

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