mpdboot: 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
/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 CentOS possible default full paths are:

/usr/bin/mpdboot - from package: mpich2

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