wpp: 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 Debian possible default full paths are:

/usr/bin/wpp - from package: wpp

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

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