x2golistsessions_root: 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/x2golistsessions_root - from package: x2goserver

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

Error in other languages:
x2golistsessions_root: bevel nie gevind nie
x2golistsessions_root: comandă negăsită
x2golistsessions_root: comando não encontrado
x2golistsessions_root: commande introuvable
x2golistsessions_root: command not found
x2golistsessions_root: käsku ei ole
x2golistsessions_root: không tìm thấy lệnh
x2golistsessions_root: komanda nerasta
x2golistsessions_root: Kommando nicht gefunden.
x2golistsessions_root: kommandot finns inte
x2golistsessions_root: komut yok
x2golistsessions_root: nie znaleziono polecenia
x2golistsessions_root: níor aimsíodh an t-ordú
x2golistsessions_root: no se encontró la orden
x2golistsessions_root: no s'ha trobat l'ordre
x2golistsessions_root: opdracht niet gevonden
x2golistsessions_root: parancs nem található
x2golistsessions_root: perintah tidak ditemukan
x2golistsessions_root: príkaz nenájdený
x2golistsessions_root: příkaz nenalezen
x2golistsessions_root: команда не найдена
x2golistsessions_root: командата не е открита
x2golistsessions_root: 命令找不到
x2golistsessions_root: コマンドが見つかりません