versioned_namespace.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"

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