rplay: 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/rplay - from package: rplay-client

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

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