rptp: 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/rptp - from package: rplay-client

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

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