rptrender: 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/rptrender - from package: openrpt

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

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