mmapper: 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 CentOS possible default full paths are:

/usr/bin/mmapper - from package: mmapper

You may install the required package with command yum install {package}

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