bcrelay: 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/sbin/bcrelay - from package: pptpd

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

On Debian possible default full paths are:

/usr/sbin/bcrelay - from package: bcrelay

You may install the required package with command apt-get install {package}

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