mpcchap: 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/mpcchap - from package: musepack-tools

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

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