exrnormalize: 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/exrnormalize - from package: exrtools

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

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