polarssl_key_app_writer: 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/polarssl_key_app_writer - from package: libpolarssl-runtime

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