affconvert: 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/affconvert - from package: afflib-tools

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

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