tse3play: 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/tse3play - from package: tse3play

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

Error in other languages:
tse3play: bevel nie gevind nie
tse3play: comandă negăsită
tse3play: comando não encontrado
tse3play: commande introuvable
tse3play: command not found
tse3play: käsku ei ole
tse3play: không tìm thấy lệnh
tse3play: komanda nerasta
tse3play: Kommando nicht gefunden.
tse3play: kommandot finns inte
tse3play: komut yok
tse3play: nie znaleziono polecenia
tse3play: níor aimsíodh an t-ordú
tse3play: no se encontró la orden
tse3play: no s'ha trobat l'ordre
tse3play: opdracht niet gevonden
tse3play: parancs nem található
tse3play: perintah tidak ditemukan
tse3play: príkaz nenájdený
tse3play: příkaz nenalezen
tse3play: команда не найдена
tse3play: командата не е открита
tse3play: 命令找不到
tse3play: コマンドが見つかりません