exrmaketiled: 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 CentOS possible default full paths are:

/usr/bin/exrmaketiled - from package: OpenEXR

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/exrmaketiled - from package: OpenEXR

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

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