wmxmms2: 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/wmxmms2 - from package: wmxmms2

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

Error in other languages:
wmxmms2: bevel nie gevind nie
wmxmms2: comandă negăsită
wmxmms2: comando não encontrado
wmxmms2: commande introuvable
wmxmms2: command not found
wmxmms2: käsku ei ole
wmxmms2: không tìm thấy lệnh
wmxmms2: komanda nerasta
wmxmms2: Kommando nicht gefunden.
wmxmms2: kommandot finns inte
wmxmms2: komut yok
wmxmms2: nie znaleziono polecenia
wmxmms2: níor aimsíodh an t-ordú
wmxmms2: no se encontró la orden
wmxmms2: no s'ha trobat l'ordre
wmxmms2: opdracht niet gevonden
wmxmms2: parancs nem található
wmxmms2: perintah tidak ditemukan
wmxmms2: príkaz nenájdený
wmxmms2: příkaz nenalezen
wmxmms2: команда не найдена
wmxmms2: командата не е открита
wmxmms2: 命令找不到
wmxmms2: コマンドが見つかりません