IDFileConverter: 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/IDFileConverter - from package: topp

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

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