monodocer: 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/monodocer - from package: monodoc

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

On Debian possible default full paths are:

/usr/bin/monodocer - from package: monodoc-base

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

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