calfjackhost: 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/calfjackhost - from package: calf-plugins

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

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