wesnothd: 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/sbin/wesnothd - from package: wesnoth-server

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

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