mod2vpl: 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/mod2vpl - from package: sword

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

On Debian possible default full paths are:

/usr/bin/mod2vpl - from package: libsword-utils

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

Error in other languages:
mod2vpl: bevel nie gevind nie
mod2vpl: comandă negăsită
mod2vpl: comando não encontrado
mod2vpl: commande introuvable
mod2vpl: command not found
mod2vpl: käsku ei ole
mod2vpl: không tìm thấy lệnh
mod2vpl: komanda nerasta
mod2vpl: Kommando nicht gefunden.
mod2vpl: kommandot finns inte
mod2vpl: komut yok
mod2vpl: nie znaleziono polecenia
mod2vpl: níor aimsíodh an t-ordú
mod2vpl: no se encontró la orden
mod2vpl: no s'ha trobat l'ordre
mod2vpl: opdracht niet gevonden
mod2vpl: parancs nem található
mod2vpl: perintah tidak ditemukan
mod2vpl: príkaz nenájdený
mod2vpl: příkaz nenalezen
mod2vpl: команда не найдена
mod2vpl: командата не е открита
mod2vpl: 命令找不到
mod2vpl: コマンドが見つかりません