xmltex: 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/xmltex - from package: xmltex

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

On Debian possible default full paths are:

/usr/bin/xmltex - from package: xmltex

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

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