caff: 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/caff - from package: signing-party

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

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