cube-config-backend: 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/cube-config-backend - from package: cube-devel

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

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