cplay: 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/cplay - from package: cplay

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

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