kc: 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/kc - from package: kimwitu

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

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