parse_dhcpd_conf: 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 Debian possible default full paths are:

/usr/share/drbl/bin/parse_dhcpd_conf - from package: drbl

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

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