polarssl_aescrypt2: 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/polarssl_aescrypt2 - from package: libpolarssl-runtime

You may install the required package with command apt-get install {package}
Error in other languages:
polarssl_aescrypt2: bevel nie gevind nie
polarssl_aescrypt2: comandă negăsită
polarssl_aescrypt2: comando não encontrado
polarssl_aescrypt2: commande introuvable
polarssl_aescrypt2: command not found
polarssl_aescrypt2: käsku ei ole
polarssl_aescrypt2: không tìm thấy lệnh
polarssl_aescrypt2: komanda nerasta
polarssl_aescrypt2: Kommando nicht gefunden.
polarssl_aescrypt2: kommandot finns inte
polarssl_aescrypt2: komut yok
polarssl_aescrypt2: nie znaleziono polecenia
polarssl_aescrypt2: níor aimsíodh an t-ordú
polarssl_aescrypt2: no se encontró la orden
polarssl_aescrypt2: no s'ha trobat l'ordre
polarssl_aescrypt2: opdracht niet gevonden
polarssl_aescrypt2: parancs nem található
polarssl_aescrypt2: perintah tidak ditemukan
polarssl_aescrypt2: príkaz nenájdený
polarssl_aescrypt2: příkaz nenalezen
polarssl_aescrypt2: команда не найдена
polarssl_aescrypt2: командата не е открита
polarssl_aescrypt2: 命令找不到
polarssl_aescrypt2: コマンドが見つかりません