mo-inline: 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/mo-inline - from package: perl-Mo

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

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