FileConverter: 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/FileConverter - from package: topp

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

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