crlhelper: 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/crlhelper - from package: mod_revocator

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

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