xmlmantohtml: 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/xmlmantohtml - from package: xmltoman

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

On Debian possible default full paths are:

/usr/bin/xmlmantohtml - from package: xmltoman

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

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