xmms2-scrobbler: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/xmms2-scrobbler - from package: xmms2-scrobbler

You may install the required package with command apt-get install {package}
Error in other languages:
xmms2-scrobbler: bevel nie gevind nie
xmms2-scrobbler: comandă negăsită
xmms2-scrobbler: comando não encontrado
xmms2-scrobbler: commande introuvable
xmms2-scrobbler: command not found
xmms2-scrobbler: käsku ei ole
xmms2-scrobbler: không tìm thấy lệnh
xmms2-scrobbler: komanda nerasta
xmms2-scrobbler: Kommando nicht gefunden.
xmms2-scrobbler: kommandot finns inte
xmms2-scrobbler: komut yok
xmms2-scrobbler: nie znaleziono polecenia
xmms2-scrobbler: níor aimsíodh an t-ordú
xmms2-scrobbler: no se encontró la orden
xmms2-scrobbler: no s'ha trobat l'ordre
xmms2-scrobbler: opdracht niet gevonden
xmms2-scrobbler: parancs nem található
xmms2-scrobbler: perintah tidak ditemukan
xmms2-scrobbler: príkaz nenájdený
xmms2-scrobbler: příkaz nenalezen
xmms2-scrobbler: команда не найдена
xmms2-scrobbler: командата не е открита
xmms2-scrobbler: 命令找不到
xmms2-scrobbler: コマンドが見つかりません