man.mpb: 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 Debian possible default full paths are:

/usr/lib/ace/bin/MakeProjectCreator/config/man.mpb - from package: mpc-ace

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