rdic_conv: 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/rdic_conv - from package: kakasi

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