chasen: 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

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/chasen - from package: chasen

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