testMP3Receiver: 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/testMP3Receiver - from package: livemedia-utils

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

Error in other languages:
testMP3Receiver: bevel nie gevind nie
testMP3Receiver: comandă negăsită
testMP3Receiver: comando não encontrado
testMP3Receiver: commande introuvable
testMP3Receiver: command not found
testMP3Receiver: käsku ei ole
testMP3Receiver: không tìm thấy lệnh
testMP3Receiver: komanda nerasta
testMP3Receiver: Kommando nicht gefunden.
testMP3Receiver: kommandot finns inte
testMP3Receiver: komut yok
testMP3Receiver: nie znaleziono polecenia
testMP3Receiver: níor aimsíodh an t-ordú
testMP3Receiver: no se encontró la orden
testMP3Receiver: no s'ha trobat l'ordre
testMP3Receiver: opdracht niet gevonden
testMP3Receiver: parancs nem található
testMP3Receiver: perintah tidak ditemukan
testMP3Receiver: príkaz nenájdený
testMP3Receiver: příkaz nenalezen
testMP3Receiver: команда не найдена
testMP3Receiver: командата не е открита
testMP3Receiver: 命令找不到
testMP3Receiver: コマンドが見つかりません