config-parser: 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/config-parser - from package: xsupplicant

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

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