esponja: command not found

Have You tried accessing the binary with the full path?

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/esponja - from package: hevea

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