MonoOfflinePlayer: 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 Debian possible default full paths are:

/usr/bin/MonoOfflinePlayer - from package: clam-networkeditor

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

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