wpe: 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/wpe - from package: xwpe

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

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