gnotravex: 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/gnotravex - from package: gnome-games-extra

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

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