ladon2.6ctl: 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/ladon2.6ctl - from package: python-ladon

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

Error in other languages:
ladon2.6ctl: bevel nie gevind nie
ladon2.6ctl: comandă negăsită
ladon2.6ctl: comando não encontrado
ladon2.6ctl: commande introuvable
ladon2.6ctl: command not found
ladon2.6ctl: käsku ei ole
ladon2.6ctl: không tìm thấy lệnh
ladon2.6ctl: komanda nerasta
ladon2.6ctl: Kommando nicht gefunden.
ladon2.6ctl: kommandot finns inte
ladon2.6ctl: komut yok
ladon2.6ctl: nie znaleziono polecenia
ladon2.6ctl: níor aimsíodh an t-ordú
ladon2.6ctl: no se encontró la orden
ladon2.6ctl: no s'ha trobat l'ordre
ladon2.6ctl: opdracht niet gevonden
ladon2.6ctl: parancs nem található
ladon2.6ctl: perintah tidak ditemukan
ladon2.6ctl: príkaz nenájdený
ladon2.6ctl: příkaz nenalezen
ladon2.6ctl: команда не найдена
ladon2.6ctl: командата не е открита
ladon2.6ctl: 命令找不到
ladon2.6ctl: コマンドが見つかりません