glue-validator: 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/glue-validator - from package: glue-validator

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

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