mkkanwa: 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/mkkanwa - from package: kakasi

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

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