wbemgcd: 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/wbemgcd - from package: sblim-wbemcli

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

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